feat: add cache in term info and classroom

[penqee]

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添加缓存：

1. 学期信息（已完成）
2. 考场（已完成）

对 Reviewer 预留的一些提醒

[codecov]

Codecov Report

Attention: Patch coverage is 36.00000% with 32 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/cache/common/get_term_info.go	0.00%	11 Missing ⚠️
pkg/cache/common/set_term_info.go	0.00%	10 Missing ⚠️
internal/common/handler.go	0.00%	5 Missing ⚠️
pkg/cache/common/common.go	0.00%	2 Missing ⚠️
pkg/cache/common/util.go	0.00%	2 Missing ⚠️
cmd/common/main.go	0.00%	1 Missing ⚠️
pkg/cache/cache.go	0.00%	1 Missing ⚠️

@@           Coverage Diff            @@
##            main    #174      +/-   ##
========================================
+ Coverage   3.17%   3.27%   +0.09%     
========================================
  Files        200     204       +4     
  Lines      41114   41277     +163     
========================================
+ Hits        1306    1351      +45     
- Misses     39736   39848     +112     
- Partials      72      78       +6     

Flag	Coverage Δ
unittest	3.27% <36.00%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/common/service/service.go	100.00% <100.00%> (ø)
internal/common/service/term.go	100.00% <100.00%> (ø)
cmd/common/main.go	0.00% <0.00%> (ø)
pkg/cache/cache.go	0.00% <0.00%> (ø)
pkg/cache/common/common.go	0.00% <0.00%> (ø)
pkg/cache/common/util.go	0.00% <0.00%> (ø)
internal/common/handler.go	0.00% <0.00%> (ø)
pkg/cache/common/set_term_info.go	0.00% <0.00%> (ø)
pkg/cache/common/get_term_info.go	0.00% <0.00%> (ø)

... and 30 files with indirect coverage changes

[penqee]

unit test时不时会failed

[mutezebra]

unit test时不时会failed

这沟槽的 unit test, 到底是底层的问题还是包的问题