feat: Add some operators and change assignment expr into assignment stmt

[vircoys]

#37

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[guance-review-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vircoys

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [vircoys]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

Merging #38 (7b02edc) into main (ad13550) will increase coverage by 1.02%.
The diff coverage is 71.21%.

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   57.13%   58.16%   +1.02%     
==========================================
  Files          46       46              
  Lines        4568     4888     +320     
==========================================
+ Hits         2610     2843     +233     
- Misses       1662     1731      +69     
- Partials      296      314      +18