feat: Allow setting metadata for ByteStream when created from file or from string

[ZanSara]

Related Issues

• fixes #6217

Proposed Changes:

• Add meta parameter to ByteStream.from_file_path() and ByteStream.from_string().
• Improve docstrings
• Add tests

How did you test it?

Unit tests

Notes for the reviewer

n/a

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 7740469769

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 88.962%

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Totals
Change from base Build 7729093798:	0.0%
Covered Lines:	4626
Relevant Lines:	5200

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💛 - Coveralls

[anakin87]

The PR looks good to me.
Should we also unfreeze the dataclass?

Slightly (un)related:
I have some doubts about the serialization of a ByteStream when it is part of a Document.
It seems to me that meta is ignored in this case.
If so, we should also take care of this in another PR.

[ZanSara]

Here the issue: #6884