fix resource leak

[gertd]

Change ds/generic.go:

• func Marshal[T any, M Message[T]](t M) ([]byte, error)
• func Unmarshal[T any, M Message[T]](b []byte) (M, error)

remove unnecessary conversion from []bytes -> bytes.Buffer (io.Reader) -> []bytes

importer.go

• add missing ctx.Done exit

	select {
	case <-ctx.Done(): // exit if context is done
		return nil
	default:
	}

[github-actions]

Pull Request Test Coverage Report for Build 7219038549

• 12 of 29 (41.38%) changed or added relevant lines in 2 files are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.07%) to 27.764%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/directory/v3/importer.go	2	19	10.53%

Files with Coverage Reduction	New Missed Lines	%
pkg/directory/v3/importer.go	5	5.0%

Totals
Change from base Build 7132817392:	0.07%
Covered Lines:	1012
Relevant Lines:	3645

---

💛 - Coveralls