Use kotlinx serializer native features

[Chuckame]

This issue will be the follow up to assist the long way of using native kotlinx serialization features like @Contextual, @SerialName, serializerModules and much more to unlock native features like value classes, serialization modules declaration, custom serializers.

This work would touch to the schema generation and the encoding/decoding codebase, while we will try to not touch the user entrypoint Avro.

[Chuckame]

Feature for @SerialName: Since there isn't native serial namespace annotation, when we set a serial name that contains dots, we can set the namespace using everything before the latest dot, and set the schema name from the last word after the latest dot

[Chuckame]

Thanks to @thake fixed the release issue, I'll work on it in next weeks

[Chuckame]

@thake Currently working on it, and found a way of encode every possible schema. I'll push the pr (wip) in next days. It will come with other fixes and optimisations.

[Chuckame]

Some primitives (char, byte, short) are going to be handled by default as int

[Chuckame]

We will be allowed of serializing unions with non-record types (like union of double, string and records by example)

[Chuckame]

AvroInline will be removed in favour of kotlin native value class because this annotation is only targeting classes with only one field. If users want to migrate, just @AvroInline data class Something(val field: Data) will become @JvmInline value class Something(val field: Data), that's all.

[Chuckame]

Closing this issue as it is too global to be implemented atomically. Also, it will be covered by multiple issues #114 #187 #166 #165 #160 #151 #114 #131