…rs, and serializers modules for serializing type numbers in polymorphic serialization without any support from the serialization plugin yet

…sses to polymorphic numbers

See commit 3289fb2.

…edSerializer` that causes the tests to break

Some miscellaneous changes:
1. Add a `getSerialPolymorphicNumberByBaseClass` function in `SerialDescriptor` to throw the appropriate exception.
1. Add `defaultDeserializerForNumber` which was missing in `PolymorphicModuleBuilder`.

…ion, and update an annotation property name

The corresponding commit: huanshankeji/kotlin@9860724

…Class` into `PluginGeneratedSerialDescriptor` where it belongs and add some more tests in `SerialPolymorphicNumberTest` (which fail for now)

…phicNumber` with `@SerialInfo` to be stored in `SerialDescriptor.annotations` and refactor related code

Main changes:
1. Extract common lazy properties in `CommonSerialDescriptor` and make both `PluginGeneratedSerialDescriptor` and `SerialDescriptorImpl` inherit it.
1. Support serial polymorphic numbers with JSON's custom implementations in `AbstractJsonTreeEncoder`, `StreamingJsonEncoder`, and `DynamicObjectEncoder` while adapting the `encodePolymorphically` and `decodeSerializableValuePolymorphic` functions.
1. Revert gradle.properties since there is no need to update the compiler plugin anymore.
1. Make all tests pass in `SerialPolymorphicNumberTest` and copy it into the Protobuf module and adapt.

…ents and reverting some unnecessary changes

…er` and make it work

See Kotlin#2598.