add benchmark for state db

[arner]

Initial results:

go test -bench=. -benchtime=1x -count=1 ./state/ 2>&1
goos: darwin
goarch: arm64
pkg: github.com/hyperledger/fabric-x-sdk/state
cpu: Apple M1 Max
BenchmarkUpdateWorldState/sqlite:file/txs=10/w=5-10                    1            663209 ns/op             15110 tx/s      75548 writes/s        40352 B/op       1221 allocs/op
BenchmarkUpdateWorldState/sqlite:file/txs=50/w=5-10                    1           2185166 ns/op             22893 tx/s     114465 writes/s       193536 B/op       5991 allocs/op
BenchmarkUpdateWorldState/sqlite:file/txs=100/w=5-10                   1           4160583 ns/op             24042 tx/s     120209 writes/s       386048 B/op      11963 allocs/op
BenchmarkUpdateWorldState/sqlite:file/txs=100/w=20-10                  1          19306000 ns/op              5180 tx/s     103603 writes/s      1550880 B/op      47286 allocs/op
BenchmarkUpdateWorldState/sqlite:memory/txs=10/w=5-10                  1            399125 ns/op             25115 tx/s     125575 writes/s        39696 B/op       1218 allocs/op
BenchmarkUpdateWorldState/sqlite:memory/txs=50/w=5-10                  1           1983458 ns/op             25218 tx/s     126088 writes/s       193648 B/op       5992 allocs/op
BenchmarkUpdateWorldState/sqlite:memory/txs=100/w=5-10                 1           3893750 ns/op             25689 tx/s     128444 writes/s       385392 B/op      11959 allocs/op
BenchmarkUpdateWorldState/sqlite:memory/txs=100/w=20-10                1          17165666 ns/op              5826 tx/s     116522 writes/s      1549712 B/op      47283 allocs/op

── UpdateWorldState  (tx/s | writes/s) ─────────────────────────
backend         txs=10/w=5       txs=50/w=5       txs=100/w=5      txs=100/w=20    
sqlite:file     15.1K | 75.5K    22.9K | 114.5K   24.0K | 120.2K   5.2K | 103.6K   
sqlite:memory   25.1K | 125.6K   25.2K | 126.1K   25.7K | 128.4K   5.8K | 116.5K   

BenchmarkGetState/sqlite:file-10                                       1            120833 ns/op            1432 B/op         46 allocs/op
BenchmarkGetState/sqlite:memory-10                                     1             85084 ns/op            1432 B/op         46 allocs/op

── GetState  (ns/op | reads/s) ─────────────────────────────────
backend         ns/op       reads/s   
sqlite:file     120625 ns   8.3K      
sqlite:memory   84834 ns    11.8K     

BenchmarkSimulation/sqlite:file/reads=20-10                            1            789750 ns/op             25346 reads/s            1267 sim/s           35072 B/op        969 allocs/op
BenchmarkSimulation/sqlite:file/reads=50-10                            1           1620625 ns/op             30857 reads/s             617.1 sim/s         81424 B/op       2388 allocs/op
BenchmarkSimulation/sqlite:file/reads=100-10                           1           3085958 ns/op             32408 reads/s             324.1 sim/s        154720 B/op       4750 allocs/op
BenchmarkSimulation/sqlite:memory/reads=20-10                          1            866917 ns/op             23080 reads/s            1154 sim/s           35008 B/op        968 allocs/op
BenchmarkSimulation/sqlite:memory/reads=50-10                          1           1970125 ns/op             25382 reads/s             507.6 sim/s         81696 B/op       2390 allocs/op
BenchmarkSimulation/sqlite:memory/reads=100-10                         1           3900541 ns/op             25641 reads/s             256.4 sim/s        154768 B/op       4751 allocs/op

── Simulation  (sim/s | reads/s)  —  5 writes per simulation ─
backend         reads=20       reads=50      reads=100     
sqlite:file     1.3K | 25.3K   617 | 30.9K   324 | 32.4K   
sqlite:memory   1.2K | 23.1K   508 | 25.4K   256 | 25.6K   

BenchmarkMixed/sqlite:file/sim-10                                      1         363501792 ns/op               137.6 reads/s
BenchmarkMixed/sqlite:memory/sim-10                                    1         272314500 ns/op               183.6 reads/s

── Mixed  (reads/s under concurrent writes at ~1K tps) ─────────
backend         reads/s   
sqlite:file     138       
sqlite:memory   184       

PASS
ok      github.com/hyperledger/fabric-x-sdk/state       18.955s