ability to create Iceberg V1 and V2 tables

[hpasumarthi]

Describe your changes

Hello Team,
We have added the following code changes

• ability to create iceberg table e.g stored by iceberg will be inserted if is_iceberg is set to true
• By passing the tbl_properties we can choose V1 or V2 iceberg table tbl_properties="('format-version'='2')"

Internal Jira ticket number or external issue link

https://jira.cloudera.com/browse/DBT-671

Testing procedure/screenshots(if appropriate):

Checklist before requesting a review

• [Yes ] I have performed a self-review of my code
• [ Notsure ] I have formatted my added/modified code to follow pep-8 standards
• [ Yes ] I have checked suggestions from python linter to make sure code is of good quality.

[hpasumarthi]

Here are the screenshots of our testing
-- We have created a iceberg V2 table with a set configurations and the table show create output confirms that the iceberg table has been create.

[tovganesh]

looks good to me

[vamshikolanu]

Changes look good to me.