Split client.Init into rm.Init and tm.Init methods

[jasondeng1997]

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What this PR does:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-commenter]

Codecov Report

Merging #286 (42e23a5) into master (cffa619) will decrease coverage by 0.16%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #286      +/-   ##
==========================================
- Coverage   50.28%   50.11%   -0.17%     
==========================================
  Files          63       66       +3     
  Lines        3305     3376      +71     
==========================================
+ Hits         1662     1692      +30     
- Misses       1553     1594      +41     
  Partials       90       90              

Impacted Files	Coverage Δ
pkg/rm/init.go	0.00% <0.00%> (ø)
pkg/tm/init.go	0.00% <0.00%> (ø)
pkg/tm/global_transaction.go	94.49% <0.00%> (-0.06%)	:arrow_down:
pkg/util/backoff/backoff.go	51.66% <0.00%> (ø)

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[jasondeng1997]

这个pr的意义我说一下，之前的tm和rm在一个包下面，逻辑混乱，但是之前的引用还没有改，所以后续还要修改引用，防止有错误。

[Issues-translate-bot]

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Let me tell you the meaning of this pr. The previous tm and rm are under the same package, and the logic is confusing, but the previous reference has not been changed, so the reference must be modified in the future to prevent errors.