Introduce query api, helper for pypika Query, remove codacy

[abondar]

Introducing helper to run pypika Query, so that users can run theirs custom queries through Tortoise tooling, providing clean access to building queries with Table interface and automatic connection management for 1 db scenarios

Also removed codacy as it was giving a lot of false positives, I am happy with our integrated linters for now

Motivation and Context

Right now - you can do basically the same, if you go deep in internal interfaces and combine such setup yourself
With helper it should be more straightforward, so users would be more encouraged to write their own custom queries, not restrained by Model boundaries

How Has This Been Tested?

Ran on non-oracle backends, tried to make behaviour consistent

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added the changelog accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing feature/query-api (2602fb5) with develop (5edbcf2)}

Summary

✅ 16 untouched benchmarks

[coveralls]

Pull Request Test Coverage Report for Build 21454019103

Details

• 66 of 68 (97.06%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 85.299%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tortoise/backends/base/client.py	4	5	80.0%
tortoise/query_api.py	47	48	97.92%

Totals
Change from base Build 21430861593:	0.07%
Covered Lines:	9442
Relevant Lines:	10710

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💛 - Coveralls