Eyevinn / mp4ff / 24051190512

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fix: improve senc parsing for separate init segments (#492)

Senc perSampleIVSize is now determined with correct priority:
1. seig sample group entry in traf
2. tenc defaultPerSampleIVSize from init segment
3. heuristic with saiz sample size validation

When moov is not available during decode (separate init segment),
the heuristic attempts parsing using saiz to validate candidates.
If an init segment is later provided via the new ParseSenc() methods,
the authoritative tenc value replaces any heuristic result.

Key changes:
- Add Fragment.ParseSenc() and MediaSegment.ParseSenc() for deferred
  senc parsing with a separate init segment
- Add saiz-based validation to reject invalid IV size candidates
- Track heuristic results via isParsedByGuess so they can be replaced
- DecodeSenc now delegates to DecodeSencSR removing duplication
- mp4ff-decrypt calls ParseSenc() when using a separate init file

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