Add component and update license identifier for dcadec
Summary: Added missing component 'multimedia.codecs' and updated license identifier to 'LGPL-2.1-or-later'. Also added homepage field.
Test Plan: Decoded multiple .dtshd files into multiple .wav files (via dcadec -m input.dtshd output_%s.wav) from 'test/samples' directory. Compared the decoded wav files with the originals from 'test/samples/reference'.
Reviewers: Triage Team, DataDrake
Reviewed By: Triage Team, DataDrake
Maniphest Tasks: T8747
Differential Revision: https://dev.getsol.us/D8863