[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/github.com/tetratelabs/wazero/internal/wasip1/wasi.go

@@ -0,0 +1,26 @@
+// Package wasip1 is a helper to remove package cycles re-using constants.
+package wasip1
+
+import (
+	"strings"
+)
+
+// InternalModuleName is not named ModuleName, to avoid a clash on dot imports.
+const InternalModuleName = "wasi_snapshot_preview1"
+
+func flagsString(names []string, f int) string {
+	var builder strings.Builder
+	first := true
+	for i, sf := range names {
+		target := 1 << i
+		if target&f != 0 {
+			if !first {
+				builder.WriteByte('|')
+			} else {
+				first = false
+			}
+			builder.WriteString(sf)
+		}
+	}
+	return builder.String()
+}