Sync to upstream/release/656

[hgoldstein]

General

All code has been re-formatted by clang-format; this is not mechanically enforced, so Luau may go out-of-sync over the course of the year.

New Solver

• Track free types interior to a block of code on Scope, which should reduce the number of free types that remain un-generalized after type checking is complete (e.g.: less errors like 'a <: number is incompatible with number).

Autocomplete

• Fragment autocomplete now does not provide suggestions within comments (matching non-fragment autocomplete behavior).
• Autocomplete now respects iteration and recursion limits (some hangs will now early exit with a "unification too complex error," some crashes will now become internal complier exceptions).

Runtime

• Add a limit to how many Luau codegen slot nodes addresses can be in use at the same time (fixes Native Code Generation Failure: internal lowering failure #1605, fixes Native codegen internal lowering failure #1558).
• Added constant folding for vector arithmetic (fixes Add constant folding of vector math like exists for numbers #1553).
• Added support for buffer.readbits and buffer.writebits (see: RFC: buffer.readbits/writebits rfcs#18).

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Co-authored-by: Aaron Weiss [email protected]
Co-authored-by: David Cope [email protected]
Co-authored-by: Hunter Goldstein [email protected]
Co-authored-by: Vighnesh Vijay [email protected]
Co-authored-by: Vyacheslav Egorov [email protected]