feat(minato): impl some math functions

[Hieuzest]

impl:

$.mod/$.module
$.abs
$.floor
$.ceil
$.round
$.exp
$.ln
$.pow/$.power
$.random

fix(postgres): transform bigint back to js number

close #20
close #24

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dab74b1) 98.12% compared to head (2fc44a9) 98.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
+ Coverage   98.12%   98.18%   +0.05%     
==========================================
  Files          27       27              
  Lines        6993     7098     +105     
  Branches     1793     1836      +43     
==========================================
+ Hits         6862     6969     +107     
+ Misses        131      129       -2     

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