[Smart holder] Support void pointer capsules (#3633)

* Make smart holder type casters support void pointer capsules.

* Fix warnings

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Fix checks

* Fix check failures under CentOS

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Remove unused regex module

* Resolve comments

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Resolve comments

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* Fix clangtidy

* Resolve comments

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