[feature] support processing of (many) more media types (#3090)

* initial work replacing our media decoding / encoding pipeline with ffprobe + ffmpeg

* specify the video codec to use when generating static image from emoji

* update go-storage library (fixes incompatibility after updating go-iotools)

* maintain image aspect ratio when generating a thumbnail for it

* update readme to show go-ffmpreg

* fix a bunch of media tests, move filesize checking to callers of media manager for more flexibility

* remove extra debug from error message

* fix up incorrect function signatures

* update PutFile to just use regular file copy, as changes are file is on separate partition

* fix remaining tests, remove some unneeded tests now we're working with ffmpeg/ffprobe

* update more tests, add more code comments

* add utilities to generate processed emoji / media outputs

* fix remaining tests

* add test for opus media file, add license header to utility cmds

* limit the number of concurrently available ffmpeg / ffprobe instances

* reduce number of instances

* further reduce number of instances

* fix envparsing test with configuration variables

* update docs and configuration with new media-{local,remote}-max-size variables

vendor/codeberg.org/gruf/go-ffmpreg/internal/wasm.go

@@ -0,0 +1,25 @@
+package internal
+
+import (
+	"os"
+
+	"github.com/tetratelabs/wazero"
+)
+
+func init() {
+	var err error
+
+	if dir := os.Getenv("WAZERO_COMPILATION_CACHE"); dir != "" {
+		// Use on-filesystem compilation cache given by env.
+		Cache, err = wazero.NewCompilationCacheWithDir(dir)
+		if err != nil {
+			panic(err)
+		}
+	} else {
+		// Use in-memory compilation cache.
+		Cache = wazero.NewCompilationCache()
+	}
+}
+
+// Shared WASM compilation cache.
+var Cache wazero.CompilationCache