Add support for CREATE NAMED COLLECTION statements (#235)

[St0rmPetrel]

This adds support for CREATE NAMED COLLECTION statements with the following features:

• IF NOT EXISTS clause
• ON CLUSTER clause
• Key-value parameters with optional [NOT] OVERRIDABLE modifiers

For the detailed syntax, please refer to: https://clickhouse.com/docs/sql-reference/statements/create/named-collection

Related to #235

[coveralls]

Pull Request Test Coverage Report for Build 21442202824

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 95 of 183 (51.91%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.009%) to 51.408%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
parser/ast_visitor.go	0	10	0.0%
parser/ast.go	32	69	46.38%
parser/parser_table.go	63	104	60.58%

Totals
Change from base Build 21354006880:	0.009%
Covered Lines:	8141
Relevant Lines:	15836

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💛 - Coveralls

[git-hulk]

@St0rmPetrel Thanks for your contribution.