[CI] Enhance the pipeline with `git diff` method#4737

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ueqri wants to merge 8 commits intoPointCloudLibrary:masterfrom ueqri:CI-git-diff-based

+420-154

Commits on Apr 28, 2021

added git diff together with main pipeline
ueqri
committed

Commits on Apr 30, 2021

Added build reason check in diff stage
ueqri
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Commits on May 3, 2021

Added git-diff in tutorials stage
ueqri
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Commits on Jun 3, 2021

Enhanced the script of tutorial stage trigger
ueqri
committed

Commits on Jun 5, 2021

Merge branch 'master' into CI-git-diff-based
ueqri
authored

Commits on Jun 6, 2021

Apply master changes after resolving the conflicts
ueqri
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Commits on Jun 7, 2021

Add description about the CI structure
ueqri
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Commits on Jun 12, 2021

Add more comments for CI
ueqri
committed