Remove ClickHouse StorageDistributed

[JaySon-Huang]

What problem does this PR solve?

Issue Number: close #3484

Problem Summary: Remove ClickHouse StorageDistributed and its related functions

What is changed and how it works?

• Remove StorageDistributed
• Remove "remote table function" inherited from ClickHouse
• Remove "cluster" inherited from ClickHouse
• Remove useless settings in Settings.h

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lidezhu

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[JaySon-Huang]

/run-all-tests

[sre-bot]

Coverage detail: https://ci-internal.pingcap.net/job/tics_ghpr_unit_test/295/cobertura/
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lines: 41.3% (45073 out of 109144)
branches: 5.7% (68106 out of 1197326)

[lidezhu]

LGTM

[JaySon-Huang]

/merge

[ti-chi-bot]

@JaySon-Huang: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: d8e841b

[JaySon-Huang]

/rebuild

[sre-bot]

Coverage detail: https://ci-internal.pingcap.net/job/tics_ghpr_unit_test/314/cobertura/
(Coverage detail url is limited office network access)

lines: 41.5% (45631 out of 109926)
branches: 5.7% (68689 out of 1199456)