[feature] Support setting private notes on accounts (#1982)

* Support setting private notes on accounts

* Reformat comment whitespace

* Add missing license headers

* Use apiutil.ParseID

* Rename Note model and cache to AccountNote

* Update golden cache config in test/envparsing.sh

* Rename gtsmodel/note.go to gtsmodel/accountnote.go

* Update AccountNote uniqueness constraint name

Now has same prefix as other indexes on this table.

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Co-authored-by: tobi <31960611+tsmethurst@users.noreply.github.com>

internal/api/model/account.go

@@ -231,3 +231,11 @@ const (
 	AccountRoleAdmin     AccountRoleName = "admin"     // Instance admin
 	AccountRoleUnknown   AccountRoleName = ""          // We don't know / remote account
 )
+
+// AccountNoteRequest models a request to update the private note for an account.
+//
+// swagger:ignore
+type AccountNoteRequest struct {
+	// Comment to use for the note text.
+	Comment string `form:"comment" json:"comment" xml:"comment"`
+}