Feat: Performance enhancements

[fveracoechea]

Description

Implement code optimizations on CVA to increase execution speed and reduce the number of operations, such as iterations and object copying.

Additional context

Let's say we have a web page made of React components, where most components utilize CVA.
Since React components render and re-render often, it's important to keep CVA's runtime overhead as low as possible. This optimization will enhance scalability, especially on large projects.

Benchmark results

pnpx ts-node ./packages/cva/src/benchmark.ts

(index)	branch name	ops/sec	average (ms)	samples
0	feat/performance-enhancement	440297	0.002	2201487
1	cva/main	125161	0.008	625810	3.52 x slower

All tests passing with no problems:

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Follow the Style Guide.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).

[vercel]

@fveracoechea is attempting to deploy a commit to the cva Team on Vercel.

A member of the Team first needs to authorize it.

[joe-bell]

This is super thoughtful of you, thanks @fveracoechea 🙏❤️

Fairly busy at the moment and this will take some time to review, so don't be too disheartened if it takes some time to get around to this! Really appreciate it

[fveracoechea]

Thanks @joe-bell 🙏 let me know if you have any suggestions or concerns, I’d be happy to help!