programs/chawan: init module

[Ladas552]

init module for chawan, added tests. Configured with toml values. Doesn't include configuration for the bookmark.md and history.uri files in the same .config/chawan folder.

project repository: https://git.sr.ht/~bptato/chawan

chawan is a TUI browser, can be executed with command cha https://git.sr.ht/~bptato/chawan

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New Module Submissions:

• Followed the general API laid out in CONTRIBUTING.md
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