feat(rsc): custom scope analyzer to replace periscopic

[james-elicx]

Description

This PR implements our own scope analyzer to replace periscopic.

Pulled in the test cases from both #1151 and #1155, and generated several more, to ensure that it works for several different edge cases.

The new analyzer gives the following benefits:

• detects shadowed variables and avoids binding them.
• binds member expressions instead of variables where possible, and de-dupes in the case where both parents and children are used.
• detects self-referenced functions.
• detects and binds default values in function params.
• support for hoisting var to the function body.
• skips re-exports from polluting scope.

I used AI to help with ensuring we were getting the right the behaviour and logic we wanted, but a large chunk of the implementation was written by myself, and the bits that weren't were refactored.

Busy Sunday!

Close #1151
Close #1155