fix(toml): stringify special values in inline arrays correctly

[YoinkingFishy]

Fixes #7162.

stringify serialized primitive arrays with JSON.stringify, which has several problems for TOML output:

• Infinity/-Infinity/NaN were turned into null (invalid TOML that fails to parse back)
• Date values were emitted as quoted ISO strings, so they parsed back as strings instead of Dates
• RegExp values became {}

Now all inline arrays are emitted element-by-element through #printAsInlineValue, matching how the same values are serialized at the top level:

stringify({ x: [Infinity, -Infinity, NaN] }) // x = [inf,-inf,nan]
stringify({ x: [new Date(0)] })              // x = [1970-01-01T00:00:00.000]
stringify({ x: [Infinity, -Infinity, NaN, {}] }) // x = [inf,-inf,nan,{}]

Arrays containing null/undefined (which TOML cannot represent) now throw Error("Cannot stringify null or undefined values") instead of an opaque Object.keys TypeError or Error("Should never reach").

Testing: deno test --allow-read --allow-run toml/ — 684 passed, 0 failed (111 ignored); deno fmt --check and deno lint clean on changed files.

AI disclosure: this PR was prepared with the assistance of AI tooling; the change was reviewed and verified locally as described above.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.02%. Comparing base (2d8f5a5) to head (3d7d2c0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7272      +/-   ##
==========================================
- Coverage   95.02%   95.02%   -0.01%     
==========================================
  Files         618      618              
  Lines       51496    51505       +9     
  Branches     9300     9311      +11     
==========================================
+ Hits        48936    48944       +8     
- Misses       2021     2022       +1     
  Partials      539      539              

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