This PR adds basic support for the Tail Call Proposal behind the --enable tail-calls flag.

Currently, it only detects direct return call() statements. I'll go ahead and support call_indirect along with some other things later.

Roadmap:

• return call() statements
• return call_indirect(...) statements
• Tail positions inside control flow (if/else, switch, ternary) where each terminating branch returns a call
• Tail positions through expression wrappers that preserve tail semantics (e.g. block-wrapped return values)
• Indirect forms (const x = call(...); return x;) when no semantic changes can be proven

Oh forgot to say, I used a LLM to scaffold initial tests. Typically I use like foo1, foo2, etc.. so this time you get nice names lol. That being said, it did miss a lot of tests i'd like to add, so I'll be adding them. The current tests are sufficient for now though

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