optimize: Add setting base path functionality

[springrain]

What type of PR is this? optimize

Check the PR title.

• [x] This PR title match the format: (optional scope):
• [x] The description of this PR title is user-oriented and clear enough for others to understand.

(Optional) Translate the PR title into Chinese. 增加修改basePath的函数

(Optional) More detail description for this PR(en: English/zh: Chinese). en: Similar to the java web's contextPath, it is convenient for nginx distribution zh: 类似java web的contextPath,方便nginx分发

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[codecov[bot]]

Codecov Report

Base: 64.46% // Head: 64.37% // Decreases project coverage by -0.09% :warning:

Coverage data is based on head (6f851ab) compared to base (b4ba993). Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #297      +/-   ##
===========================================
- Coverage    64.46%   64.37%   -0.10%     
===========================================
  Files           84       84              
  Lines         8288     8294       +6     
===========================================
- Hits          5343     5339       -4     
- Misses        2583     2593      +10     
  Partials       362      362              

Impacted Files	Coverage Δ
pkg/route/engine.go	61.22% <0.00%> (-0.85%)	:arrow_down:
pkg/common/timer/timer.go	61.90% <0.00%> (-19.05%)	:arrow_down:

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