feat: add effort directive

[moorejs]

• Quick Checklist

• I have read the contributing guidelines
• I have written new tests, as applicable (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• I have added a changeset, if applicable

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

New directive to control the encoding effort.

• What is the new behavior (if this is a feature change)?

Users can specify efforts values that differ from the default effort for a given format.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this
  PR?)

No

• Other information:

"min" and "max" keywords create a dependency on the format value in the metadata of the image. This was a compromise since specifying an exact number doesn't really make sense if you're generating multiple formats:
e.g. ?format=webp;avif&effort=7 would mean webp effort is default since it is out of range.

[changeset-bot]

🦋 Changeset detected

Latest commit: 21bf449

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
imagetools-core	Minor
vite-imagetools	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.17%. Comparing base (5b75d3f) to head (21bf449).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #618      +/-   ##
==========================================
+ Coverage   93.64%   94.17%   +0.52%     
==========================================
  Files          32       33       +1     
  Lines        1196     1235      +39     
  Branches      193      206      +13     
==========================================
+ Hits         1120     1163      +43     
+ Misses         76       72       -4     

Flag	Coverage Δ
imagetools-core	94.17% <100.00%> (+0.52%)	⬆️
vite-imagetools	94.17% <100.00%> (+0.52%)	⬆️

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[moorejs]

Thanks for the review. Generating docs appears to function now but the links are relative to my fork so I'll defer that.

[benmccann]

Thank you! Sorry for the delay in merging this. I'll do a release after I get through a bit more of the PR queue