Upgrade vendored Flow parser to 0.320.0

[cknitt]

Summary

• upgrade the vendored Flow parser from 0.267.0 to 0.320.0, the final release of the OCaml implementation
• update the vendored source set and provenance documentation
• retain ReScript's private Dune integration and existing compiler-facing interface
• keep dependency and OCaml upgrades out of this PR

This is the second PR in the "Flow Forward" series. Updating the parser separately gives us a stable base before changing the OCaml toolchain.

Related to #8567.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.92%. Comparing base (afdaaa8) to head (53a429b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8588   +/-   ##
=======================================
  Coverage   75.91%   75.92%           
=======================================
  Files         475      475           
  Lines       63033    63033           
=======================================
+ Hits        47853    47859    +6     
+ Misses      15180    15174    -6     

see 2 files with indirect coverage changes

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commit: 53a429b

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[cristianoc]

I guess the flow parser will be aggressively cut to only what's needed by the compiler after this. And that most of it will just go, leaving the rest easy to maintain via agents in future if required.

[cknitt]

I guess the flow parser will be aggressively cut to only what's needed by the compiler after this. And that most of it will just go, leaving the rest easy to maintain via agents in future if required.

Or possibly moved to JSOO's JS parser if feasible. See #8567.