[major] rename config and endpoint

[WindzCUHK]

Description

changes

1. fix naming consistency in config.go
2. config version to v2.0.0
3. move unit test data to /test/data
4. add log level support
5. fix lint: SA1019: t.BuildNameToCertificate is deprecated: NameToCertificate only allows associating a single certificate with a given name. Leave that field nil to let the library select the first compatible chain from Certificates. (staticcheck)
6. Add doc for /svccert
7. fix endpoint and docs naming consistency
   1. /access-token => /accesstoken
   2. For docs, roletoken => role token

https://github.com/yahoojapan/athenz-client-sidecar/blob/34243ebf47a378697799c1acf6071cf4f098f267/docs/example_config.yaml#L1-L69

Type of change

• [x] New feature
• [x] Refactoring (no functional changes, no api changes)

Flags

• [x] breaks backward compatibility
• [x] requires a documentation update

Related issue/PR

• Fixes #34
• Closes #32, #26, #39

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Checklist

• [x] Followed the guidelines in the CONTRIBUTING document
• [x] Added prefix [major]/[minor]/[patch]/[skip] in the PR title
• [x] Tested and linted the code
• [x] Commented the code
• [x] Made corresponding changes to the documentation
• [x] Confirmed no dropping in test coverage (by Codecov)
• [x] Passed all pipeline checking
• [x] Approved by >1 reviewer

Checklist for maintainer

• [x] Use Squash and merge
• [x] Double-confirm the merge message has prefix [major]/[minor]/[patch]/[skip]
• [x] Delete the branch after merge

[codecov-commenter]

Codecov Report

Merging #42 into master will increase coverage by 0.25%. The diff coverage is 97.74%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
+ Coverage   90.60%   90.86%   +0.25%     
==========================================
  Files          13       13              
  Lines        1096     1127      +31     
==========================================
+ Hits          993     1024      +31     
  Misses         79       79              
  Partials       24       24              

Impacted Files	Coverage Δ
config/config.go	88.23% <ø> (ø)
usecase/tenantd.go	83.54% <89.47%> (+1.59%)	:arrow_up:
service/server.go	95.31% <91.66%> (ø)
handler/handlers.go	100.00% <100.00%> (ø)
main.go	53.84% <100.00%> (+17.48%)	:arrow_up:
router/routes.go	100.00% <100.00%> (ø)
service/access.go	93.92% <100.00%> (ø)
service/role.go	94.41% <100.00%> (ø)
service/svccert.go	92.85% <100.00%> (ø)
service/tls.go	94.73% <100.00%> (-0.14%)	:arrow_down:

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