[Docs] Add analysis&msic docs

[Ezra-Yu]

Motivation

Add docs about analysis

• add analysis_log doc
• add get_flops doc
• add analysis_result doc
• add eval_result doc
• add msic doc

Modification

Add CN\EN analysis docs.

BC-breaking (Optional)

no.

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Merging #525 (83bcc7c) into master (7b37bc5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #525   +/-   ##
=======================================
  Coverage   79.75%   79.75%           
=======================================
  Files         107      107           
  Lines        6120     6120           
  Branches     1046     1046           
=======================================
  Hits         4881     4881           
  Misses       1105     1105           
  Partials      134      134           

Flag	Coverage Δ
unittests	79.75% <ø> (ø)

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[mzr1996]

LGTM