[Do not merge] Experimenting with requirefromcwd

[vrn-sn]

No description provided.

[vrn-sn]

@skanosue recent commit changes the bad error message to something maybe a bit better

Old:

> lute varun_test/requirer.luau incorrect_path
error requiring module "@self": could not reset to requiring context
stacktrace:
[C] function proxyrequire
[C] function requirefromcwd
./varun_test/requirer.luau:5

New:

> lutedebug varun_test/requirer.luau incorrect_path            
./varun_test/requirer.luau:5: file not found: /Users/vsaini/git/lute/incorrect_path
stacktrace:
[C] function requirefromcwd
./varun_test/requirer.luau:5

[vrn-sn]

@skanosue if we want to support requiring an absolute path directly like I did in this draft, requirepath might be a better name (still keeping requirefrompath for the other API we've talked about, nice symmetry there).

Otherwise, we could just error on absolute paths like require does and keep this one named requirefromcwd.

[vrn-sn]

Superseded by #461.