Perf Improvements to Custom Commands' Execution Path

[TalZaccai]

This PR introduces some perf improvements to the execution path of custom commands:

• Unlatched access to custom commands' data structures in CustomCommandManager
• Eliminating expensive string-based RespCommandInfo access for arity check by adding arity property to commands classes.

Benchmarking results:

Current branch:

CustomOperations:

Method	Params	Mean	Error	StdDev	Allocated
CustomRawStringCommand	None	39.04 us	0.657 us	0.549 us	-
CustomObjectCommand	None	147.69 us	2.832 us	2.511 us	24000 B
CustomTransaction	None	91.46 us	1.817 us	2.092 us	-
CustomProcedure	None	73.25 us	0.966 us	0.807 us	-

ModuleOperations:

Method	Params	Mean	Error	StdDev	Gen0	Allocated
ModuleNoOpRawStringReadCommand	None	36.99 us	0.707 us	1.851 us	-	-
ModuleNoOpRawStringRmwCommand	None	45.56 us	0.879 us	1.144 us	-	-
ModuleNoOpObjRmwCommand	None	68.98 us	1.374 us	2.477 us	-	8800 B
ModuleNoOpObjReadCommand	None	55.09 us	0.936 us	1.078 us	-	5600 B
ModuleNoOpProc	None	29.64 us	0.308 us	0.288 us	-	-
ModuleNoOpTxn	None	28.20 us	0.346 us	0.307 us	-	-
ModuleJsonGetCommand	None	121.39 us	2.409 us	5.630 us	-	72800 B
ModuleJsonSetCommand	None	218.26 us	4.297 us	7.060 us	0.7324	228800 B

main:

CustomOperations:

Method	Params	Mean	Error	StdDev	Median	Allocated
CustomRawStringCommand	None	46.06 us	0.692 us	0.824 us	45.70 us	-
CustomObjectCommand	None	175.01 us	4.435 us	12.216 us	170.85 us	24000 B
CustomTransaction	None	98.49 us	1.959 us	2.932 us	98.16 us	-
CustomProcedure	None	83.08 us	1.629 us	2.938 us	82.53 us	-

ModuleOperations:

Method	Params	Mean	Error	StdDev	Gen0	Allocated
ModuleNoOpRawStringReadCommand	None	46.36 us	0.927 us	1.624 us	-	-
ModuleNoOpRawStringRmwCommand	None	54.67 us	1.083 us	0.960 us	-	-
ModuleNoOpObjRmwCommand	None	84.71 us	1.627 us	4.400 us	-	8800 B
ModuleNoOpObjReadCommand	None	69.37 us	1.373 us	1.527 us	-	5600 B
ModuleNoOpProc	None	39.89 us	0.794 us	1.259 us	-	-
ModuleNoOpTxn	None	34.98 us	0.649 us	1.136 us	-	-
ModuleJsonGetCommand	None	131.93 us	2.474 us	4.884 us	-	72800 B
ModuleJsonSetCommand	None	235.78 us	3.061 us	2.863 us	0.4883	228801 B

[badrishc]

looking good, thanks!

[badrishc]

why not start the expandable map at 0 so that we dont pay the cost of memory in the common case that there are no custom commands? then then grow as 1,2,4, etc.

[badrishc]

fix memory use by default.

[badrishc]

why not start the expandable map at 0 so that we dont pay the cost of memory in the common case that there are no custom commands? then then grow as 1,2,4, etc. (for CCM and CCMS)