[Feature] Support SQL string composition

The redshift connector currently supports parameterised queries (aka bind variables) which is great.

However some of our use cases require other parts of a Redshift SQL query to be dynamically created. These include components such as the table name, the schema... and are commonly referred to as Identifiers. For example ``` f"SELECT * FROM {schema}.{table}"```

Other libraries such as [pg8000](https://github.com/tlocke/pg8000#many-sql-statements-can-t-be-parameterized) and [psycopg](https://www.psycopg.org/docs/sql.html) have developed modules to escape these variables via identifiers.

Beyond usability, the main advantage of this approach is that it helps with SQL injection attacks.

Start by reviewing the connector's existing parameterised-query support, then compare the identifier-composition approaches documented by pg8000 and psycopg. Done means users can safely compose dynamic Redshift identifiers such as schemas and table names, with protection against SQL injection.

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