[feature] Conversations API (#3013)

* Implement conversations API

* Sort and page conversations by last status ID

* Appease linter

* Fix deleting conversations and statuses

* Refactor to make migrations automatic

* Lint

* Update tests post-merge

* Fixes from live-fire testing

* Linter caught a format problem

* Refactor tests, fix cache

* Negative test for non-DMs

* Run conversations advanced migration on testrig startup as well as regular server startup

* Document (lack of) side effects of API method for deleting a conversation

* Make not-found check less nested for readability

* Rename PutConversation to UpsertConversation

* Use util.Ptr instead of IIFE

* Reduce cache used by conversations

* Remove unnecessary TableExpr/ColumnExpr

* Use struct tags for both unique constraints on Conversation

* Make it clear how paging with GetDirectStatusIDsBatch should be used

* Let conversation paging skip conversations it can't render

* Use Bun NewDropTable

* Convert delete raw query to Bun

* Convert update raw query to Bun

* Convert latestConversationStatusesTempTable raw query partially to Bun

* Convert conversationStatusesTempTable raw query partially to Bun

* Rename field used to store result of MaxDirectStatusID

* Move advanced migrations to their own tiny processor

* Catch up util function name with main

* Remove json.… wrappers

* Remove redundant check

* Combine error checks

* Replace map with slice of structs

* Address processor/type converter comments

- Add context info for errors
- Extract some common processor code into shared methods
- Move conversation eligibility check ahead of populating conversation

* Add error context when dropping temp tables

internal/config/helpers.gen.go

@@ -2975,6 +2975,62 @@ func GetCacheClientMemRatio() float64 { return global.GetCacheClientMemRatio() }
 // SetCacheClientMemRatio safely sets the value for global configuration 'Cache.ClientMemRatio' field
 func SetCacheClientMemRatio(v float64) { global.SetCacheClientMemRatio(v) }
 
+// GetCacheConversationMemRatio safely fetches the Configuration value for state's 'Cache.ConversationMemRatio' field
+func (st *ConfigState) GetCacheConversationMemRatio() (v float64) {
+	st.mutex.RLock()
+	v = st.config.Cache.ConversationMemRatio
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheConversationMemRatio safely sets the Configuration value for state's 'Cache.ConversationMemRatio' field
+func (st *ConfigState) SetCacheConversationMemRatio(v float64) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.ConversationMemRatio = v
+	st.reloadToViper()
+}
+
+// CacheConversationMemRatioFlag returns the flag name for the 'Cache.ConversationMemRatio' field
+func CacheConversationMemRatioFlag() string { return "cache-conversation-mem-ratio" }
+
+// GetCacheConversationMemRatio safely fetches the value for global configuration 'Cache.ConversationMemRatio' field
+func GetCacheConversationMemRatio() float64 { return global.GetCacheConversationMemRatio() }
+
+// SetCacheConversationMemRatio safely sets the value for global configuration 'Cache.ConversationMemRatio' field
+func SetCacheConversationMemRatio(v float64) { global.SetCacheConversationMemRatio(v) }
+
+// GetCacheConversationLastStatusIDsMemRatio safely fetches the Configuration value for state's 'Cache.ConversationLastStatusIDsMemRatio' field
+func (st *ConfigState) GetCacheConversationLastStatusIDsMemRatio() (v float64) {
+	st.mutex.RLock()
+	v = st.config.Cache.ConversationLastStatusIDsMemRatio
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheConversationLastStatusIDsMemRatio safely sets the Configuration value for state's 'Cache.ConversationLastStatusIDsMemRatio' field
+func (st *ConfigState) SetCacheConversationLastStatusIDsMemRatio(v float64) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.ConversationLastStatusIDsMemRatio = v
+	st.reloadToViper()
+}
+
+// CacheConversationLastStatusIDsMemRatioFlag returns the flag name for the 'Cache.ConversationLastStatusIDsMemRatio' field
+func CacheConversationLastStatusIDsMemRatioFlag() string {
+	return "cache-conversation-last-status-ids-mem-ratio"
+}
+
+// GetCacheConversationLastStatusIDsMemRatio safely fetches the value for global configuration 'Cache.ConversationLastStatusIDsMemRatio' field
+func GetCacheConversationLastStatusIDsMemRatio() float64 {
+	return global.GetCacheConversationLastStatusIDsMemRatio()
+}
+
+// SetCacheConversationLastStatusIDsMemRatio safely sets the value for global configuration 'Cache.ConversationLastStatusIDsMemRatio' field
+func SetCacheConversationLastStatusIDsMemRatio(v float64) {
+	global.SetCacheConversationLastStatusIDsMemRatio(v)
+}
+
 // GetCacheEmojiMemRatio safely fetches the Configuration value for state's 'Cache.EmojiMemRatio' field
 func (st *ConfigState) GetCacheEmojiMemRatio() (v float64) {
 	st.mutex.RLock()