typed version of WhereCache, with 3X speed up and 99% memory reduce

[halfcrazy]

typed version of WhereCache, fix #366 #365

Usage

    lsList := []LogicalSwitch{}
    client.WhereCacheTyped(ovs, func(ls *MyLogicalSwitch) bool {
        return strings.HasPrefix(ls.Name, "ext_")
    }).List(&lsList)

bench report

goos: linux
goarch: amd64
pkg: github.com/ovn-kubernetes/libovsdb/client
cpu: Intel(R) Core(TM) i5-9600K CPU @ 3.70GHz
BenchmarkWhereCacheTypedList/predicate_returns_none-4         	     289	   4079307 ns/op	  906546 B/op	   20040 allocs/op
BenchmarkWhereCacheTypedList/predicate_returns_all-4          	       7	 148840727 ns/op	17648513 B/op	  210132 allocs/op
BenchmarkWhereCacheTypedList/predicate_on_an_arbitrary_condition-4         	      51	  21615530 ns/op	 2783326 B/op	   41172 allocs/op
BenchmarkWhereCacheTypedList/predicate_matches_name-4                      	     255	   4666906 ns/op	  908429 B/op	   20061 allocs/op
BenchmarkWhereCacheTypedList/typed:_predicate_returns_none-4               	    1186	    950534 ns/op	  656529 B/op	      40 allocs/op
BenchmarkWhereCacheTypedList/typed:_predicate_returns_all-4                	       7	 150332743 ns/op	17408165 B/op	  190130 allocs/op
BenchmarkWhereCacheTypedList/typed:_predicate_on_an_arbitrary_condition-4  	      67	  17703972 ns/op	 2533008 B/op	   21172 allocs/op
BenchmarkWhereCacheTypedList/typed:_predicate_matches_name-4               	     937	   1147315 ns/op	  658396 B/op	      61 allocs/op
PASS
ok  	github.com/ovn-kubernetes/libovsdb/client	22.232s

Benchmark Group	Implementation	Iterations	Time per Operation	Memory per Operation	Allocations per Operation
Predicate Returns None	Regular	289	4079307 ns/op	906546 B/op	20040 allocs/op
	Typed	1186 (+310%)	950534 ns/op (-76.7%)	656529 B/op (-27.6%)	40 allocs/op (-99.8%)
Predicate Returns All	Regular	7	148840727 ns/op	17648513 B/op	210132 allocs/op
	Typed	7 (+0%)	150332743 ns/op (+1.0%)	17408165 B/op (-1.4%)	190130 allocs/op (-9.5%)
Arbitrary Condition	Regular	51	21615530 ns/op	2783326 B/op	41172 allocs/op
	Typed	67 (+31.4%)	17703972 ns/op (-18.1%)	2533008 B/op (-9.0%)	21172 allocs/op (-48.6%)
Matches Name	Regular	255	4666906 ns/op	908429 B/op	20061 allocs/op
	Typed	937 (+267.5%)	1147315 ns/op (-75.4%)	658396 B/op (-27.5%)	61 allocs/op (-99.7%)