banking-bench: Add and rearrange options

- Add write-lock-contention option, replacing same_payer
- write-lock-contention also has a same-batch-only value, where
  contention happens only inside batches, not between them
- Rename num-threads to batches-per-iteration, which is closer to what
  it is actually doing.
- Add num-banking-threads as a new option
- Rename packets-per-chunk to packets-per-batch, because this is closer
  to what's happening; and it was previously confusing that num-chunks
  had little to do with packets-per-chunk.

Example output for a iterations=100 and a permutation of inputs:

contention,threads,batchsize,batchcount,tps
none,           3,192, 4,65290.30
none,           4,192, 4,77358.06
none,           5,192, 4,86436.65
none,           3, 12,64,43944.57
none,           4, 12,64,65852.15
none,           5, 12,64,70674.37
same-batch-only,3,192, 4,3928.21
same-batch-only,4,192, 4,6460.15
same-batch-only,5,192, 4,7242.85
same-batch-only,3, 12,64,11377.58
same-batch-only,4, 12,64,19582.79
same-batch-only,5, 12,64,24648.45
full,           3,192, 4,3914.26
full,           4,192, 4,2102.99
full,           5,192, 4,3041.87
full,           3, 12,64,11316.17
full,           4, 12,64,2224.99
full,           5, 12,64,5240.32

(cherry picked from commit d2c6c04)

banking-bench/Cargo.toml

@@ -9,7 +9,7 @@ homepage = "https://solana.com/"
 publish = false
 
 [dependencies]
-clap = "3.1.8"
+clap = { version = "3.1.8", features = ["derive"] }
 crossbeam-channel = "0.5"
 log = "0.4.14"
 rand = "0.7.0"