refactor: Move AST types to rome_rowan

[MichaReiser]

Summary

This PR parametrizes the Ast traits with a Language type and moves them to the rome_rowan crate so that they can be shared between rome_js_syntax and rome_css_syntax (and potential future crates).

Other changes:

• Renames the JS/CSS Syntax* aliases to JsSyntax* and CssSyntax. For example: type SyntaxNode = rome_rowan::SyntaxNode<JsLanguage> is now called JsSyntaxNode. I believe this helps understanding the difference between the different nodes and aligns the naming with the kind types (that are called JsSyntaxKind and CssSyntaxKind
• Moved most util methods to the SyntaxNode struct.
• Renamed cast to try_cast and move the SyntaxNodeExt::to to method to AstNode with the name cast.

Test Plan

cargo test

[github-actions]

Parser conformance results on ubuntu-latest

js/262

Test result	main count	This PR count	Difference
Total	45250	45250	0
Passed	44310	44310	0
Failed	940	940	0
Panics	0	0	0
Coverage	97.92%	97.92%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	39	39	0
Passed	36	36	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.31%	92.31%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	584	584	0
Passed	508	508	0
Failed	76	76	0
Panics	0	0	0
Coverage	86.99%	86.99%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	15983	15983	0
Passed	12167	12167	0
Failed	3816	3816	0
Panics	0	0	0
Coverage	76.12%	76.12%	0.00%

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[ematipico]

This is a great change! I will need it for the formatter too :)