Add syntax highlighting for Solidity, Vyper, and Cairo

[jakelang]

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Description

This pull request adds syntax highlighting support for three languages from the Ethereum ecosystem.

• Solidity: The most popular language for writing Ethereum smart contracts
• Vyper: An alternative, emerging language for Ethereum smart contracts.
• Cairo: A language used to write contracts on StarkNet, an L2 scaling solution for Ethereum using STARKs.

All of the syntax files are sourced from https://github.com/davidhq/SublimeEthereum at the commit mentioned in sublime/syntaxes/extra/README.md. I did not add this repository as a submodule because I used Sublime to generate .sublime-syntax files for Vyper and Cairo from their respective .tmlanguage files.

The aforementioned repository appears to be well-maintained with changes made 3 days ago to support Solidity 0.8.13. Credit goes to the maintainers of this repository for the syntax files.

[Keats]

Thanks for that. I'm actually going to holdd off adding more syntaxes until #1787 has been decided since I don't want to add something just to remove it.

[jakelang]

@Keats any decision re: #1787?

[Keats]

The decision is not planned soon, especially since you can easily load your own syntaxes/themes.