1. ensure FatBank prioritze Ack read over Ack write to downstream
coalescer
2. Between FatBank and L2, use the new sourceGenerator to allow both Read and
Write Reqs sharing the same pool of available src_ids
Issues addressed:
1. FatBank ack to downstream coalescer with the correct size on ChannelD
2. FatBank ack to downstream coalescer immediately after W Req
3. FatBank generates unique ID for W Req to L2
4. Allows coalescer to config max Coal to L1 ReadSize at compile time
Ungoing issues:
1. Magic Number
2. Verification
3. Multi-Bank Integration
