tables: Correctly handle Integer timestamps from the SQLite backend

Quassel stores its timestamps as INTEGERs when using the SQLite backend. Since
SQLAlchemy expects strings here instead[1], we have to handle this manually.

This commit extends the existing process_result_value() function to handle a
conversion from a unix timestamp to a proper datetime object, makes sure that
the right impl is chosen for both SQLite and PostgreSQL, and adds the
process_bind_param() function which takes care of the conversion back to a unix
timestamp when binding values for SELECT statements.

[1] https://docs.sqlalchemy.org/en/14/core/type_basics.html#sqlalchemy.types.DateTime

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