Add missing parameters to insert_many method

[dvzubarev]

Add overwrite_mode, keep_none, merge similar to insert method. They were added in arangodb 3.7

[codecov-commenter]

Codecov Report

Merging #212 (958aec8) into main (76ca077) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #212   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files          26       26           
  Lines        3735     3741    +6     
=======================================
+ Hits         3730     3736    +6     
  Misses          5        5           

Impacted Files	Coverage Δ
arango/collection.py	99.76% <100.00%> (+<0.01%)	:arrow_up:

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[joowani]

Thanks for the PR @dvzubarev!