Add pdf and jxl formats

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[Copilot]

Pull Request Overview

Adds support for two new formats—JPEG XL (jxl) and PDF (pdf)—to imgproxy-js-core.

• Extended the SkipProcessing and Format type definitions to include jxl and pdf.
• Updated the options validators in src/options so that jxl and pdf are recognized.
• Added a changeset entry to document the new formats.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/types/skipProcessing.ts	Added "jxl" to the SkipProcessing union
src/types/format.ts	Updated doc comments and added "jxl"/"pdf" to Format
src/options/skipProcessing.ts	Included "jxl" in the extNames validation array
src/options/format.ts	Added jxl and pdf keys to the formatValues map
.changeset/lovely-streets-write.md	Documented the addition of pdf and jxl formats

Comments suppressed due to low confidence (2)

src/options/skipProcessing.ts:9

• Add unit tests to cover the new jxl extension in skipProcessing so that validation and parsing behave as expected.

  "jxl",

src/options/format.ts:16

• Add or update unit tests for jxl and pdf in the formatValues validation to ensure both formats are correctly accepted and handled.

  pdf: true,