Support SQL syntax of `{% cache %} ... {% endcache %}` tag

[kokokuo]

What’s the problem you're trying to solve

In #150, In order to enhance our query performance after users send the API request to run our data endpoint to get the result from the data source. We need to provide a Caching (pre-loading) Layer with the duckDB to enhance query performance.

Describe the solution you’d like

Define the tag scope of {% cache %} ... {% endcache %} to parse the scope of {% cache %} ... {% endcache %} tag and send the SQL to duckDB.

-- The "cache" scope means the SQL statement will send the query to duckDB cache data source
{% cache %}
select * from order
  where type = {{ context.params.type }}
  and where exists (
    select * from product  where price >= {{ context.params.price }}
    and order.product_id = product.id
  )
{% endcache %}

Additional Context

In the build time, define a CacheTagBuilder to parse {% cache %} … {% endcache %} to the AST tree, set the cache metadata name cache.vulcan.com to make schema parser #151 to work, then keep to the artifact.