Testing sqlglot's insert

[anuunchin]

Description

Please check out #2399 where the motivation behind this PR is explained.

Here, we're just testing if an INSERT INTO statement created with the following steps works for different destinations:

• Assume two tables have the same schema
• Create a SELECT * FROM statement using an IbisRelation with something like:

  dataset = pipeline.dataset()
  select_relation_query = dataset.table("select_from_table").query()  

• Make the target_table with:

  target_table = client.make_qualified_table_name("insert_into_table")

• Make sqlglot create an INSERT INTO ... SELECT * FROM ... statement with something like:

  import sqlglot.expressions as sge
  query = sge.insert(
     expression=select_relation_query,
     into=target_table  
     dialect=dialect,
  ).sql()

  The source code of insert. Thanks to @zilto for pointing into this direction 🙏

Related Issues

• Relates to Ibis / sqlglot insert statement research #2399

Additional Context

Some destination don't really recognize double quotes ("") for identifiers, so there's a special handling in the test.

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[anuunchin]

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