Fix Slot Validation for Custom Proc

[vazois]

This PR fixes slot verification for custom proc.
It introduces the following:

• Iterative slot verification interface.
• Slot verification fix for WATCH command.
• Separation of WATCH_MS and WATCH_OS as separate commands instead of WATCH subcommands
• Added BDN for custom proc

RespClusterBench

Method	Mean	Error	StdDev	Allocated
Get	22.13 us	0.028 us	0.026 us	-
Set	21.47 us	0.041 us	0.039 us	-
MGet	18.13 us	0.024 us	0.022 us	-
MSet	15.55 us	0.032 us	0.030 us	-
CPBSET	178.25 us	0.398 us	0.372 us	-

RespClusterDisableSlotVerificationBench

Method	Mean	Error	StdDev	Allocated
Get	18.58 us	0.027 us	0.025 us	-
Set	17.19 us	0.026 us	0.023 us	-
MGet	17.77 us	0.042 us	0.039 us	-
MSet	15.67 us	0.034 us	0.032 us	-
CPBSET	152.47 us	0.159 us	0.149 us	-