SQLite: Add additional btests, which also cover general storage functionality

- New erase/overwrite tests
- Change existing sqlite-basic test to use async
- Test passing bad keys to validate backend type checking
- New test for compound keys and values

testing/btest/Baseline/scripts.base.frameworks.storage.sqlite-basic/out

@@ -1,8 +1,4 @@
 ### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
-T
-value
-T
-value2
-T
-got empty result
-value2
+put result, T
+get result, value5678
+get result same as inserted, T