add rate limit for xtokens transfer

[wangjj9219]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (030db44) 67.54% compared to head (0ffff31) 67.63%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2652      +/-   ##
==========================================
+ Coverage   67.54%   67.63%   +0.08%     
==========================================
  Files          70       72       +2     
  Lines        8338     9417    +1079     
==========================================
+ Hits         5632     6369     +737     
- Misses       2706     3048     +342     

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