[WIP] DataStore spike - performance comparison

### Some Read Benchmarks

````
Test Name:	Akavache.Tests.Performance.DataStoreReadTests.SequentialSimpleReads
-------------------
1: 1
10: 2
100: 35
1000: 325
10000: 3337
100000: 31991
------------------------------
1: 4
10: 2
100: 46
1000: 287
10000: 3027
100000: 31301
```

```
Test Name:	Akavache.Tests.Performance.Sqlite3ReadTests.SequentialSimpleReads
-------------------
1: 5
10: 3
100: 40
1000: 347
10000: 3085
100000: 31296
```

```
Test Name:	Akavache.Tests.Performance.DataStoreReadTests.ParallelSimpleReads
-------------------
1: 65
10: 8
100: 42
1000: 329
10000: 3174
100000: 34456
-----------------------
1: 74
10: 4
100: 42
1000: 321
10000: 3520
100000: 35457
---------------------
1: 74
10: 4
100: 42
1000: 321
10000: 3520
100000: 35457
```

```
Test Name:	Akavache.Tests.Performance.Sqlite3ReadTests.ParallelSimpleReads
---------------------
1: 11
10: 3
100: 18
1000: 183
10000: 1676
100000: 17814
```