Upgrade pyo3 to 0.22

[jelmer]

Summary

This updates PyO3 to version 0.22, and adapt to the new APIs.

Test Plan

cd native && cargo test

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.26%. Comparing base (b0d145d) to head (03ca796).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1180   +/-   ##
=======================================
  Coverage   91.26%   91.26%           
=======================================
  Files         261      261           
  Lines       26883    26883           
=======================================
  Hits        24535    24535           
  Misses       2348     2348           

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[zsol]

This looks good to me, thanks! I need some time before I can merge this to figure out what other things need upgrading to 0.22 internally at Meta

[mcepl]

When trying to build with this patch (and after refreshing vendor/ directory) I get this:

   Compiling libcst v1.4.0 (/tmp/libcst-1.4.0/native/libcst)
warning: unused imports: `DeflatedAsynchronous as Asynchronous` and `DeflatedFormattedStringText as FormattedStringText`
  --> libcst/src/nodes/mod.rs:55:29
   |
55 |         DeflatedArg as Arg, DeflatedAsynchronous as Asynchronous, DeflatedAttribute as Attribute,
   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
66 |         DeflatedFormattedStringText as FormattedStringText, DeflatedFrom as From,
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: unused import: `DeflatedImportStar as ImportStar`
  --> libcst/src/nodes/mod.rs:89:9
   |
89 |         DeflatedImportStar as ImportStar, DeflatedSemicolon as Semicolon,
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: use of deprecated constant `py::libcst_native::__pyfunction_parse_module::SIGNATURE`: this function has implicit defaults for the trailing `Option<T>` arguments 
         = note: these implicit defaults are being phased out 
         = help: add `#[pyo3(signature = (source, encoding=None))]` to this function to silence this warning and keep the current behavior
  --> libcst/src/py.rs:13:8
   |
13 |     fn parse_module(source: String, encoding: Option<&str>) -> PyResult<PyObject> {
   |        ^^^^^^^^^^^^
   |
   = note: `#[warn(deprecated)]` on by default

warning: field `string_start` is never read
  --> libcst/src/tokenizer/core/string_types.rs:74:9
   |
70 | pub struct FStringNode {
   |            ----------- field in this struct
...
74 |     pub string_start: Option<TextPositionSnapshot>,
   |         ^^^^^^^^^^^^
   |
   = note: `FStringNode` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
   = note: `#[warn(dead_code)]` on by default

warning: struct `Details` is never constructed
  --> libcst/src/parser/errors.rs:36:12
   |
36 |     struct Details {
   |            ^^^^^^^

warning: `libcst` (lib) generated 5 warnings (run `cargo fix --lib -p libcst` to apply 2 suggestions)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 19.84s

[jelmer]

I've fixed the signature warning and have rebased to resolve merge conflicts.

@mcepl the other warnings you're listing happen in "main" for me as well, they're not specific to this branch.

[mcepl]

Thank you, I will update the patch.

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