Add ReplyTo Usage for Kotlin

[chris-tbd]

This pull request primarily updates the ExchangesApiProvider and PfiStructureTest classes in the site/testsuites/testsuite-kotlin/src/test/kotlin/docs/tbdex/pfi directory. The changes enable the write method to handle a replyTo parameter, which is used to provide callback functionality. The write method now inserts callback data into the dataProvider if replyTo is not empty. Additionally, the PFI initializes routes test in PfiStructureTest has been updated to pass the replyTo parameter to the write method.

Changes to ExchangesApiProvider:

• site/testsuites/testsuite-kotlin/src/test/kotlin/docs/tbdex/pfi/ExchangesApiProvider.kt: The write method now accepts a replyTo parameter with a default value of an empty string.
• site/testsuites/testsuite-kotlin/src/test/kotlin/docs/tbdex/pfi/ExchangesApiProvider.kt: If replyTo is not empty, the write method creates a callbackData map and inserts it into dataProvider.

Changes to PfiStructureTest:

• site/testsuites/testsuite-kotlin/src/test/kotlin/docs/tbdex/pfi/PfiStructureTest.kt: The PFI initializes routes test now passes replyTo to the write method. If replyTo is null, an empty string is passed instead.

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