cluster: integrate tispark

[AstroProfundis]

What problem does this PR solve?

Add TiSpark support to cluster component, being able to deploy and manage a cluster with TiSpark as one of the components.

Close #348

What is changed and how it works?

• Add topology and component specifications for TiSpark
• Download packages as needed
• Render configs and scripts for TiSpark from template and specs
• Deploy necessary files to server
• Start/Stop tispark nodes
• Scale out of TiSpark nodes
• Handling upgrade process of TiSpark nodes
• Destroy / scale in of TiSpark nodes
• UI adjustment and testing 🚧
• Add documentation 🚧
• Import TiSpark nodes from TiDB-Ansible (will be done in another PR)

Check List

Tests

• Unit test
• Integration test
• Manual test

Code changes

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

Side effects

• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to update the documentation

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #531 into master will increase coverage by 0.65%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
+ Coverage   50.73%   51.38%   +0.65%     
==========================================
  Files         220      225       +5     
  Lines       16102    16559     +457     
==========================================
+ Hits         8169     8509     +340     
- Misses       6787     6864      +77     
- Partials     1146     1186      +40     

Flag	Coverage Δ
#coverage	51.38% <ø> (+0.65%)	⬆️

Impacted Files	Coverage Δ
.../pingcap/tiup/components/cluster/command/reload.go	60.86% <0.00%> (-5.80%)	⬇️
...ingcap/tiup/components/cluster/command/scale_in.go	58.58% <0.00%> (-5.16%)	⬇️
.../pingcap/tiup/components/playground/utils/utils.go	27.65% <0.00%> (-4.26%)	⬇️
...thub.com/pingcap/tiup/pkg/cluster/spec/instance.go	75.36% <0.00%> (-2.60%)	⬇️
...pingcap/tiup/components/cluster/command/upgrade.go	68.50% <0.00%> (-1.77%)	⬇️
.../pingcap/tiup/components/cluster/command/deploy.go	77.13% <0.00%> (-0.38%)	⬇️
...ngcap/tiup/components/cluster/command/scale_out.go	64.50% <0.00%> (-0.26%)	⬇️
...c/github.com/pingcap/tiup/pkg/cluster/spec/util.go	69.23% <0.00%> (ø)
...ithub.com/pingcap/tiup/pkg/cluster/executor/ssh.go	65.43% <0.00%> (ø)
...om/pingcap/tiup/pkg/cluster/embed/autogen_pkger.go	100.00% <0.00%> (ø)
... and 22 more

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[birdstorm]

LGTM

[lucklove]

LGTM