Implement TOML

[Pistonight]

Issue

TOML is not supported

Fix

Support TOML

References taken from

• https://microsoft.github.io/monaco-editor/monarch.html
• The YAML tokenizer

Valiation

Unit tests added according to https://toml.io/en/v1.0.0. Most of the tests are taken directly from the examples in the spec, but some are tweaked to have more coverage.

Also tested in a testing app with vs-dark and light theme

vs-dark

vs

Other

Closes #2798

This is my first monarch language. I didn't do benchmark on performance but it can probably be made faster. However I just made the states in the way it made sense in my head.

The sample file is taken from https://github.com/rust-lang/rust/blob/master/triagebot.toml, which covers a lot of the interesting cases

[Pistonight]

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[IgorKha]

anyone?