* [Kotlin] Control the generation of reflection with --reflect-names.
Tested:
```
$ cmake -G "Unix Makefiles" && make && ./tests/flatc/main.py
...
KotlinTests.EnumValAttributes
[PASSED]
KotlinTests.EnumValAttributes_ReflectNames
[PASSED]
KotlinTests: 2 of 2 passsed
...
35 of 35 tests passed
```
* [Kotlin] Fix SampleBinary by converting Byte to UByte for ubyte fields.
* [Kotlin] Annotate all generated classes with kotlin.ExperimentalUnsignedTypes.
* [Java] Fix key lookup returning null clashing with default value
A field with key attribute must always be written on the message so it
can be looked up by key. There is a edge case where inserting a key
field with same value as default would prevent it to be written on
the message and later cannot be found when searched by key.
* [Kotlin] Fix key lookup returning null clashing with default value
A field with key attribute must always be written on the message so it
can be looked up by key. There is a edge case where inserting a key
field with same value as default would prevent it to be written on
the message and later cannot be found when searched by key.
Co-authored-by: Derek Bailey <derekbailey@google.com>
