分片上传 v2 重新提交

[bachue]

• 重写了分片上传代码，使 v1 和 v2 可以共享基类代码
• 增加了分片上传 v2 相关接口

[qiniu-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bachue

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/qiniu/api.v7/blob/master/OWNERS)~~ [bachue] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[codecov[bot]]

Codecov Report

Merging #236 (279f367) into master (8e84b3e) will increase coverage by 5.81%. The diff coverage is 72.46%.

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
+ Coverage   57.46%   63.27%   +5.81%     
==========================================
  Files          22       25       +3     
  Lines        1702     1985     +283     
==========================================
+ Hits          978     1256     +278     
- Misses        556      561       +5     
  Partials      168      168              

Impacted Files	Coverage Δ
storage/resume_uploader_deprecated.go	0.00% <0.00%> (ø)
storage/form_upload.go	53.96% <55.55%> (+2.82%)	:arrow_up:
storage/resume_uploader_v2.go	67.64% <67.64%> (ø)
storage/uploader_base.go	71.42% <71.42%> (ø)
storage/resume_uploader.go	75.63% <75.63%> (ø)
storage/resume_uploader_base.go	77.19% <77.19%> (ø)
storage/resume_uploader_apis.go	82.07% <82.07%> (ø)
storage/base64_upload.go	67.21% <100.00%> (+5.78%)	:arrow_up:
internal/log/logger.go	47.36% <0.00%> (-7.18%)	:arrow_down:
storage/uc.go	58.29% <0.00%> (-1.84%)	:arrow_down:
... and 22 more

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