Improvements in command handling #5

[TalZaccai]

• Introducing RawStringInput struct to simplify main store command processing
  • BasicCommands
  • ArrayCommands
  • MainStoreOps
  • AdvancedOps
  • BitmapCommands
  • BitmapOps
  • HyperLogLogCommands
  • HyperLogLogOps
  • KeyAdminCommands
  • CustomRawStringFunctions
• Supporting RawStringInput serialization/deserialization for AOF recovery
• Relaying parse state to custom commands / transactions
• Fixing bug in PFCOUNT logic

Benchmarking results:
main:

Method	Mean	Error	StdDev	Allocated
InlinePing	1.493 us	0.0225 us	0.0188 us	-
Set	8.963 us	0.1783 us	0.1751 us	-
SetEx	13.153 us	0.2306 us	0.4388 us	-
Get	5.804 us	0.0819 us	0.0726 us	-
ZAddRem	73.947 us	1.1658 us	1.0334 us	23552 B
LPushPop	80.001 us	1.5987 us	3.0801 us	30721 B
SAddRem	64.207 us	1.2544 us	2.3560 us	16384 B
HSetDel	79.286 us	1.0700 us	1.0009 us	55297 B
MyDictSetGet	116.929 us	1.1018 us	0.9200 us	30720 B

current branch:

Method	Mean	Error	StdDev	Allocated
InlinePing	1.492 us	0.0185 us	0.0173 us	-
Set	8.841 us	0.1280 us	0.1198 us	-
SetEx	13.146 us	0.1434 us	0.1341 us	-
Get	6.049 us	0.0763 us	0.0714 us	-
ZAddRem	71.771 us	1.2070 us	1.1291 us	23552 B
LPushPop	71.520 us	1.2398 us	1.1597 us	30721 B
SAddRem	59.022 us	0.7709 us	0.7211 us	16384 B
HSetDel	76.690 us	1.2125 us	1.0748 us	55297 B
MyDictSetGet	114.768 us	1.0504 us	0.9825 us	30720 B