leaudio: Add functions for setting CIG parameters

Added functions for getting Maximum SDU Size and
Retransmission Number, for a particular Direction and CIS ID,
for setting the CIG parameters.

This patch is needed by the below mentioned patch
and resolves the review comment in the below patch
to keep the change as a separate patch

https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2058269

Test: Verified Maximum SDU Size and Retransmission Number
      are obtained and set correctly in the CIG

Bug: 225020659
Tag: #feature
Test: atest BluetoothInstrumentationTests
Change-Id: If25fde195002ca5eb2b16f0f3eb1ff37c68e7afd