* feat: annotate JadxPlugin with NotNull

Allows for better Kotlin support

* feat: add support for custom resources loader

* feat: add support for xapk resources loading

* fix: rename "decode" to "load"

* refactor: annotate JadxCodeInput with NotNull

* feat: add support for xapk code loading

* feat: add xapk support to file filter

* fix code formatting

* revert NotNull annotation

* several improvements

* refactor: fix typo

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Co-authored-by: Skylot <skylot@gmail.com>