Add support for with blocks

[kaidaguerre]

Query providers will allow a new block type called with. Similar to a with clause in a postgres CTE, the with block will allow users to specify additional queries or sql statements to run before running their sql/query.

A query provider may can contain 0 or more with blocks
With blocks are executed sequentially, in order (steampipe can parallelize them if it determines there are no dependencies).

The results of previous with queries are available to subsequent with queries, as well as to sql, args, and param.
with is not a top-level named resource - it is ONLY a block within query provider resources. The reuse pattern for with would be to use a named query, and reference that query in multiple with blocks.