RPC Server: Support macros in execute and compile tasks

[drewbanin]

Feature

Feature description

The RPC Server compile/ and execute/ endpoints should accept macros defined inline in raw SQL. Our current strategy of sending the same text to the macros and sql arguments of the endpoints doesn't work because of the macro cache. The following query results in maximum recursion depth exceeded:

{{ test_macros() }}

{% macro test_macros() %}
  1
{% endmacro %}

The reason this happens is because we re-parse the entire contents of the macro file at runtime, so we end up in an infinite recursion scenario.