feat: support OSC 7 notify working directory

[rzhw]

Need to add tests, this seems to be blocked on https://github.com/charmbracelet/x/pull/274

However creating this PR now to gather feedback on the API itself.

Tests added.

Fixes https://github.com/charmbracelet/sequin/issues/24

[coveralls]

Pull Request Test Coverage Report for Build 11976165119

Details

• 13 of 13 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 90.374%

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Totals
Change from base Build 11974720212:	0.2%
Covered Lines:	629
Relevant Lines:	696

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💛 - Coveralls