add jpeg quality option

[cabreraalex]

Description of changes:

Adds option for JPEG quality.

Issue #, if available:

• Fixes #811

Merge Checklist:

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General

• [ ] I have read the contributor guidelines
• [ ] This is a documentation change or typo fix. If so, skip the rest of this checklist.
• [ ] I certify that the changes I am introducing will be backward compatible, and I have discussed concerns about this, if any, with the MosaicML team.
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Tests

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• [ ] I have added tests that prove my fix is effective or that my feature works (if appropriate).
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• [ ] I have added unit and/or integration tests as appropriate to ensure backward compatibility of the changes.

[karan6181]

Hey @cabreraalex , thanks for creating a PR. One minor comment, can you please update your PR with the changes that are not relevant to this PR? Seems like there are some spacing changes, single/double quotes changes, etc.

[cabreraalex]

oops yup, done

[snarayan21]

@cabreraalex Mind addressing the review comments when you have some time? Thanks!

[cabreraalex]

AFAI can tell just the config is passed, e.g. from jpeg:12 only the 12 is passed to from_str: https://github.com/mosaicml/streaming/blob/45c2132fbd3e0621c403496b51b5b56e1c174a22/streaming/base/format/mds/encodings.py#L591

There is no formal type for the quality, just integer

[snarayan21]

@cabreraalex Mind adding the test that @ethantang-db mentioned and we can get this in?