[kotlin] Add KotlinPartialPackageNamesIndex to reduce number of (redundant) access to KotlinExactPackagesIndex

#KTIJ-20568 Fixed

(cherry picked from commit 2f8a939a1c558423a74f392568e0338764628dea)

(cherry picked from commit 5e47c29bc48c3926bea9c220ba014330fa9fadc4)

GitOrigin-RevId: b9d3b1fa056aaaed92ba5af5375e00869febd427

^KTIJ-18977

(cherry picked from commit 971a3e30dff6b2560cdd287fcce90ebf01799917)

GitOrigin-RevId: 8dcdc06fa900fefdf7d2d394ea2e6f0948b2617c

^KTIJ-18977 Fixed

(cherry picked from commit 7bb1c7b5c13c44d268cf64a8b76b9376ef01bb76)

GitOrigin-RevId: 4a91cbc550fab03090f69f57497d8cd4c89d500e

^KTIJ-20493 Fixed

(cherry picked from commit c1fbbe47db3dbe955545e1ba9169f419bba55f4a)

GitOrigin-RevId: 9e1a69f72f317c6d57773c31f69bac844033c6eb

to be consistent with all the other Kotlin UAST elements

GitOrigin-RevId: de7e81e7a06649e99e576cc6aed71b652993eca0

closes https://github.com/JetBrains/intellij-community/pull/1888

GitOrigin-RevId: f38da3e4dc948bbc98ec9c691953cdbd7d5d6f76

Improved the code structure according to CR suggestions.

^KTIJ-20557 Fixed

GitOrigin-RevId: dd0299cbe350b0aa962fadf96b8113c2a857fd6e

Starting from 1.6.20, passing nullable arguments of generic types (`T`)
to the Java methods where the corresponding arguments are annotated with
`@NotNull` causes warnings (they are to be replaced with errors in
future releases, see KT-36770 for details):
  * NULLABLE_TYPE_PARAMETER_AGAINST_NOT_NULL_TYPE_PARAMETER
  * WRONG_NULLABILITY_FOR_JAVA_OVERRIDE.

This quick fix allows users to fix most cases of these warnings by
adding a non-nullable upper bound to the type parameter in question.

If the parameter has no upper bound, the `Any` upper bound is added:
`fun <T> foo() { … }` →  `fun <T : Any> foo() { … }`

If the type parameter already has an explicitly nullable upper bound,
this bound is replaced with its non-nullable subtype:
`fun <T : Foo?> foo() { … }` →  `fun <T : Foo> foo() { … }`

The quick fix provides actions for TYPE_MISMATCH and NOTHING_TO_OVERRIDE
errors that the compiler generates instead of nullability warnings If
loading of `@NotNull` Java values as definitely non-nullable types is
enabled.

^KTIJ-20557 Fixed

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Since 1.7.0 will be changed -M suffix to Beta

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See https://github.com/JetBrains/kotlin/commit/3f8fff55cf20d303ef3fe6edf02d4694e423d8c5

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