[experiment] add alternative wasm sqlite3 implementation available via build-tag (#2863)

This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).

vendor/github.com/tetratelabs/wazero/internal/wasm/counts.go

@@ -0,0 +1,51 @@
+package wasm
+
+import "fmt"
+
+// SectionElementCount returns the count of elements in a given section ID
+//
+// For example...
+// * SectionIDType returns the count of FunctionType
+// * SectionIDCustom returns the count of CustomSections plus one if NameSection is present
+// * SectionIDHostFunction returns the count of HostFunctionSection
+// * SectionIDExport returns the count of unique export names
+func (m *Module) SectionElementCount(sectionID SectionID) uint32 { // element as in vector elements!
+	switch sectionID {
+	case SectionIDCustom:
+		numCustomSections := uint32(len(m.CustomSections))
+		if m.NameSection != nil {
+			numCustomSections++
+		}
+		return numCustomSections
+	case SectionIDType:
+		return uint32(len(m.TypeSection))
+	case SectionIDImport:
+		return uint32(len(m.ImportSection))
+	case SectionIDFunction:
+		return uint32(len(m.FunctionSection))
+	case SectionIDTable:
+		return uint32(len(m.TableSection))
+	case SectionIDMemory:
+		if m.MemorySection != nil {
+			return 1
+		}
+		return 0
+	case SectionIDGlobal:
+		return uint32(len(m.GlobalSection))
+	case SectionIDExport:
+		return uint32(len(m.ExportSection))
+	case SectionIDStart:
+		if m.StartSection != nil {
+			return 1
+		}
+		return 0
+	case SectionIDElement:
+		return uint32(len(m.ElementSection))
+	case SectionIDCode:
+		return uint32(len(m.CodeSection))
+	case SectionIDData:
+		return uint32(len(m.DataSection))
+	default:
+		panic(fmt.Errorf("BUG: unknown section: %d", sectionID))
+	}
+}