redo(ticdc): support gcs scheme in redo log (#7993)

[ti-chi-bot]

This is an automated cherry-pick of #7993

What problem does this PR solve?

Issue Number: close #7987, close #6335

What is changed and how it works?

1. Extract external_storage util to manage external storage creation.
2. Extract pkg/redo and add support to gcs and azure scheme.
3. Add ConsistentConfig.ValidateAndAdjust.
4. Refactor code and test structure, and remove some useless logic.

Check List

Tests

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

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`.

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.1@38f1d35). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 714ea87 differs from pull request most recent head 9d46704. Consider uploading reports for the commit 9d46704 to get more accurate results

Additional details and impacted files

Flag	Coverage Δ
cdc	61.6854% <0.0000%> (?)
dm	52.1676% <0.0000%> (?)

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@@               Coverage Diff                @@
##             release-6.1      #8016   +/-   ##
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[CharlesCheung96]

/run-all-tests

[CharlesCheung96]

/merge

[ti-chi-bot]

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

Commit hash: 9d46704

[CharlesCheung96]

/run-verify