feat(dev): support keepNames option for optimizeDeps config

[itsthekeming]

Description

Fixes the undesired behavior detailed in this comment on #2376 by reverting to the original approach of using an option instead of forcing keepNames to true.

Additional Context

This PR is practically identical to #2376 except that I added a default value to the docs as suggested by @patak-js here.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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