Feature/extend orm client

[jonkan81]

Adds:

• Parametrized ORM queries
• Parametrized execute statements
• Interfaces for RqliteClient and RqliteOrmClient useful for dependency injection, unit testing etc.

[otoolep]

@arthrp -- would you review this, and merge if it looks good to you?

[otoolep]

Thanks for your contribution, @jonkan81

[otoolep]

Say we want to enable continuous testing, what's a good environment? Something on CircleCI?

[arthrp]

@otoolep
Sorry, due to personal issues I'm not too active here. For CI the easiest option is Github actions

[arthrp]

@SjoVJonatan Thanks for your contribution! There're still few outstanding minor issues but I think we can merge now