Create rosetta stone statements

This MR adds basic support for creating and fetching rosetta stone statements.

Design considerations:

• What property do we sort statements by default?
• Passing object position inputs might be confusing as to what entry corresponds to what template property.

What will be done in separate MRs:

• Convert queries to cypher dsl
• Support for filtering statements by context and other filtering parameters (to be discussed)
• Support for updating rosetta stone statements
• Support "extracted with" property indicating the extraction tool used

Disclaimer: I did not do any performance testing regarding the rosetta stone statement adapter.