feat: add format tool

[mangoGoForward]

Signed-off-by: mango xu.weiKyrie@foxmail.com

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What this PR does / why we need it:

Add a formatting tool and format project files. Resolved #884

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-commenter]

Codecov Report

Merging #885 (aac3c65) into master (77383b8) will decrease coverage by 0.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #885      +/-   ##
==========================================
- Coverage   32.05%   31.76%   -0.29%     
==========================================
  Files          70       71       +1     
  Lines        7740     7741       +1     
==========================================
- Hits         2481     2459      -22     
- Misses       4984     5000      +16     
- Partials      275      282       +7     

Impacted Files	Coverage Δ
pkg/apisix/plugin.go	80.00% <0.00%> (-20.00%)	⬇️
pkg/apisix/cluster.go	28.73% <0.00%> (-3.85%)	⬇️
pkg/apisix/route.go	36.91% <0.00%> (-2.02%)	⬇️
test/e2e/e2e.go	100.00% <0.00%> (ø)

---

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[mangoGoForward]

Hi @lingsamuel ,lint-checker-ci failed, and some hyperlink got status 500, maybe we should fix first.

[mangoGoForward]

Hi @lingsamuel ,lint-checker-ci failed, and some hyperlink got status 500, maybe we should fix first.

But I can link to those websites.

[tao12345666333]

LGTM
thanks

[lingsamuel]

Hi @lingsamuel ,lint-checker-ci failed, and some hyperlink got status 500, maybe we should fix first.

This could just be a coincidental failure. Just ignore it.