Add p0 test cases, including:
aggregate
join
union
order by
group by
keyword
arithmetic operators
logical operators
case function
coalesce
between
in
like
limit
where
regexp
window function
runtime filter
schema change
Support register suite plugin to add third-party function.
See
1. register in: ${DORIS_HOME}/regression-test/plugins/plugin_example.groovy
2. usage: ${DORIS_HOME}/regression-test/suites/demo/test_plugin.groovy
3. doc: ${DORIS_HOME}/docs/zh-CN/developer-guide/regression-testing.md
