[performance] media processing improvements (#1288)

* media processor consolidation and reformatting, reduce amount of required syscalls

Signed-off-by: kim <grufwub@gmail.com>

* update go-store library, stream jpeg/png encoding + use buffer pools, improved media processing AlreadyExists error handling

Signed-off-by: kim <grufwub@gmail.com>

* fix duration not being set, fix mp4 test expecting error

Signed-off-by: kim <grufwub@gmail.com>

* fix test expecting media files with different extension

Signed-off-by: kim <grufwub@gmail.com>

* remove unused code

Signed-off-by: kim <grufwub@gmail.com>

* fix expected storage paths in tests, update expected test thumbnails

Signed-off-by: kim <grufwub@gmail.com>

* remove dead code

Signed-off-by: kim <grufwub@gmail.com>

* fix cached presigned s3 url fetching

Signed-off-by: kim <grufwub@gmail.com>

* fix tests

Signed-off-by: kim <grufwub@gmail.com>

* fix test models

Signed-off-by: kim <grufwub@gmail.com>

* update media processing to use sync.Once{} for concurrency protection

Signed-off-by: kim <grufwub@gmail.com>

* shutup linter

Signed-off-by: kim <grufwub@gmail.com>

* fix passing in KVStore GetStream() as stream to PutStream()

Signed-off-by: kim <grufwub@gmail.com>

* fix unlocks of storage keys

Signed-off-by: kim <grufwub@gmail.com>

* whoops, return the error...

Signed-off-by: kim <grufwub@gmail.com>

* pour one out for tobi's code <3

Signed-off-by: kim <grufwub@gmail.com>

* add back the byte slurping code

Signed-off-by: kim <grufwub@gmail.com>

* check for both ErrUnexpectedEOF and EOF

Signed-off-by: kim <grufwub@gmail.com>

* add back links to file format header information

Signed-off-by: kim <grufwub@gmail.com>

Signed-off-by: kim <grufwub@gmail.com>

vendor/codeberg.org/gruf/go-iotools/read.go

@@ -0,0 +1,28 @@
+package iotools
+
+import (
+	"io"
+)
+
+// ReaderFunc is a function signature which allows
+// a function to implement the io.Reader type.
+type ReaderFunc func([]byte) (int, error)
+
+func (r ReaderFunc) Read(b []byte) (int, error) {
+	return r(b)
+}
+
+// ReadCloser wraps an io.Reader and io.Closer in order to implement io.ReadCloser.
+func ReadCloser(r io.Reader, c io.Closer) io.ReadCloser {
+	return &struct {
+		io.Reader
+		io.Closer
+	}{r, c}
+}
+
+// NopReadCloser wraps an io.Reader to implement io.ReadCloser with empty io.Closer implementation.
+func NopReadCloser(r io.Reader) io.ReadCloser {
+	return ReadCloser(r, CloserFunc(func() error {
+		return nil
+	}))
+}