cluster,dm: add support of ssh-proxy

[9547]

What problem does this PR solve?

Try to implement #1417

What is changed and how it works?

This PR contains 3 proxy:

1. Pure SSH Proxy via easyssh or the built-in ssh client: used by many actions, such as check, deploy, display, exec...
2. HTTP over SSH Proxy: used by PdAPI, DMAPi, such as fetch the component's status
3. TCP over SSH Proxy: used by etcd grpc, such as UpdateTopology

You can enable this feature with the --ssh-proxy-host parameter，at the same time, we also provide some other --ssh-proxy-xxx parameters.

Check List

Tests

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

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[codecov-commenter]

Codecov Report

Merging #1438 (15d36d5) into master (56496c3) will increase coverage by 8.35%.
The diff coverage is 34.60%.

❗ Current head 15d36d5 differs from pull request most recent head 31feae6. Consider uploading reports for the commit 31feae6 to get more accurate results

@@            Coverage Diff             @@
##           master    #1438      +/-   ##
==========================================
+ Coverage   25.11%   33.46%   +8.35%     
==========================================
  Files         264      228      -36     
  Lines       20903    18573    -2330     
==========================================
+ Hits         5249     6216     +967     
+ Misses      14850    11262    -3588     
- Partials      804     1095     +291     

Flag	Coverage Δ
cluster	33.46% <34.60%> (?)
integrate	33.46% <34.60%> (+18.09%)	⬆️
tiup	?
unittest	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/cluster/command/import.go	17.24% <0.00%> (ø)
pkg/cluster/ansible/config.go	0.00% <0.00%> (ø)
pkg/cluster/executor/ssh.go	25.60% <0.00%> (+16.90%)	⬆️
pkg/cluster/manager/scale_in.go	0.00% <0.00%> (ø)
pkg/cluster/manager/scale_out.go	0.00% <0.00%> (-8.43%)	⬇️
pkg/cluster/manager/upgrade.go	0.00% <0.00%> (-5.60%)	⬇️
pkg/cluster/operation/operation.go	69.56% <ø> (ø)
pkg/cluster/operation/scale_in.go	0.00% <0.00%> (ø)
pkg/cluster/spec/spec.go	66.56% <0.00%> (+14.09%)	⬆️
pkg/cluster/spec/tikv.go	24.75% <0.00%> (+8.42%)	⬆️
... and 268 more

---

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[9547]

/cc @AstroProfundis

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• AstroProfundis

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[AstroProfundis]

/merge

[ti-chi-bot]

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

Commit hash: 31feae6