feat: allow for disabling of extension loading

[nick-youngblut]

Is your feature request related to a problem?

My code:

def get_data() -> BaseBackend:
    conn = ibis.postgres.connect(
        host=XXX,
        port=XXX,
        database=XXX,
        user=XXX,
        password=XXX,
    )

    return conn.table("my_table$raw").execute()

The warning:

UserWarning: Failed to load hstore extension: permission denied to create extension "hstore"
HINT:  Must have CREATE privilege on current database to create this extension.

It would be helpful if one could disable the attempted loading of extensions (e.g., hstore).

What is the motivation behind your request?

An unnecessary warning is generated for read-only postgresql databases.

Describe the solution you'd like

Allow for easy disabling of extension loading

What version of ibis are you running?

10.4.0

What backend(s) are you using, if any?

postgresql

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