[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/sys/clock.go

@@ -0,0 +1,26 @@
+package sys
+
+// ClockResolution is a positive granularity of clock precision in
+// nanoseconds. For example, if the resolution is 1us, this returns 1000.
+//
+// Note: Some implementations return arbitrary resolution because there's
+// no perfect alternative. For example, according to the source in time.go,
+// windows monotonic resolution can be 15ms. See /RATIONALE.md.
+type ClockResolution uint32
+
+// Walltime returns the current unix/epoch time, seconds since midnight UTC
+// 1 January 1970, with a nanosecond fraction.
+type Walltime func() (sec int64, nsec int32)
+
+// Nanotime returns nanoseconds since an arbitrary start point, used to measure
+// elapsed time. This is sometimes referred to as a tick or monotonic time.
+//
+// Note: There are no constraints on the value return except that it
+// increments. For example, -1 is a valid if the next value is >= 0.
+type Nanotime func() int64
+
+// Nanosleep puts the current goroutine to sleep for at least ns nanoseconds.
+type Nanosleep func(ns int64)
+
+// Osyield yields the processor, typically to implement spin-wait loops.
+type Osyield func()