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-error-handling/.stderr

@@ -1,2 +1,3 @@
 ### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
 error in <...>/sqlite-error-handling.zeek, line 20: Failed to open backend SQLITE: SQLite call failed: unable to open database file (Storage::open_backend(Storage::SQLITE, to_any_coerce opts, to_any_coerce str, to_any_coerce str))
+error in <...>/sqlite-error-handling.zeek, line 28: Failed to store data: type of key passed (count) does not match backend's key type (str) (Storage::put(b, (coerce [$key=bad_key, $value=value, $async_mode=F] to Storage::PutArgs)))

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

@@ -1 +1,2 @@
 ### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+Put result on closed handle: 0