pk_max_plaintext_length
actual fun pk_max_plaintext_length(decryption: OlmPkDecryptionPointer, cipherTextLength: ULong): ULong
actual fun pk_max_plaintext_length(decryption: OlmPkDecryptionPointer, cipherTextLength: ULong): ULong
expect fun pk_max_plaintext_length(decryption: OlmPkDecryptionPointer, cipherTextLength: ULong): ULong