[REQ] [kotlin-client] Support parsing `java.net.URI` with moshi

Created by: chigichan24

Is your feature request related to a problem? Please describe.

Now, Moshi is not supported by parse java.net.URI. So, if your request or response parameters defined as java.net.URI, generated apiClient throws an exception like as below.

 Caused by: java.lang.IllegalArgumentException: Platform class java.net.URI requires explicit JsonAdapter to be registered
    for class java.net.URI
    for java.util.List<java.net.URI> photoUrls
    for class net.chigita.openapigenexample.gen.pet.model.Pet
        at com.squareup.moshi.Moshi$LookupChain.exceptionWithLookupStack(Moshi.java:388)
        at com.squareup.moshi.Moshi.adapter(Moshi.java:157)
        at com.squareup.moshi.Moshi.adapter(Moshi.java:105)
        at com.squareup.moshi.Moshi.adapter(Moshi.java:74)
        at com.squareup.moshi.CollectionJsonAdapter.newArrayListAdapter(CollectionJsonAdapter.java:54)
        at com.squareup.moshi.CollectionJsonAdapter$1.create(CollectionJsonAdapter.java:38)
        at com.squareup.moshi.Moshi.adapter(Moshi.java:145)
        at com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory.create(KotlinJsonAdapter.kt:262)
        at com.squareup.moshi.Moshi.adapter(Moshi.java:145)
        at com.squareup.moshi.Moshi.adapter(Moshi.java:105)
        at retrofit2.converter.moshi.MoshiConverterFactory.responseBodyConverter(MoshiConverterFactory.java:89)
        at retrofit2.Retrofit.nextResponseBodyConverter(Retrofit.java:362)
        at retrofit2.Retrofit.responseBodyConverter(Retrofit.java:345)
        at retrofit2.HttpServiceMethod.createResponseConverter(HttpServiceMethod.java:124)
        	... 12 more
     Caused by: java.lang.IllegalArgumentException: Platform class java.net.URI requires explicit JsonAdapter to be registered
        at com.squareup.moshi.ClassJsonAdapter$1.create(ClassJsonAdapter.java:75)
        at com.squareup.moshi.Moshi.adapter(Moshi.java:145)

here is a sample project.

But in the context of multiplatform, UriAdapter is supported (link). So how about add UriAdapter for MoshiBuilder

Describe the solution you'd like

To resolve this issue, we have to two changes.

1. Fix modules/openapi-generator/src/main/resources/kotlin-client/jvm-common/infrastructure/URIAdapter.kt.mustache

package {{packageName}}.infrastructure

{{#kotlinx_serialization}}
import kotlinx.serialization.KSerializer
import kotlinx.serialization.Serializer
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder
import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
import kotlinx.serialization.descriptors.PrimitiveKind
import kotlinx.serialization.descriptors.SerialDescriptor
{{/kotlinx_serialization}}
{{#moshi}}
import com.squareup.moshi.FromJson
import com.squareup.moshi.ToJson
{{/moshi}}
import java.net.URI

{{#moshi}}
{{#nonPublicApi}}internal {{/nonPublicApi}}class UriAdapter {
    @ToJson
    fun toJson(uri: URI) = uri.toString()

    @FromJson
    fun fromJson(s: String) = URI.create(s)
}
{{/moshi}}
{{#kotlinx_serialization}}
@Serializer(forClass = URI::class)
object UriAdapter : KSerializer<URI> {
    override fun serialize(encoder: Encoder, value: URI) {
        encoder.encodeString(value.toASCIIString())
    }

    override fun deserialize(decoder: Decoder): URI = URI(decoder.decodeString())

    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("URI", PrimitiveKind.STRING)
}
{{/kotlinx_serialization}}

2. Fix modules/openapi-generator/src/main/resources/kotlin-client/jvm-common/infrastructure/Serializer.kt.mustache

@JvmStatic
    val moshiBuilder: Moshi.Builder = Moshi.Builder()
        .add(OffsetDateTimeAdapter())
        .add(LocalDateTimeAdapter())
        .add(LocalDateAdapter())
        .add(UUIDAdapter())
        .add(ByteArrayAdapter())
        {{^moshiCodeGen}}
        .add(KotlinJsonAdapterFactory())
        {{/moshiCodeGen}}
        .add(BigDecimalAdapter())
        .add(BigIntegerAdapter())
        .add(UriAdapter()) // Add this line

Describe alternatives you've considered

Just use --type-mapping option

Additional context