fix wasm build

[hugocaillard]

Description

• Update clar2wasm and clarity to get the wasm compiliation fixes
• Make wsts optional
• Don't use std::time in wasm
• Some code was lost during a previous (get_block_time)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b3feafb) 40.28% compared to head (0e30a30) 40.33%.
Report is 1 commits behind head on develop.

❗ Current head 0e30a30 differs from pull request most recent head c85f84e. Consider uploading reports for the commit c85f84e to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1334      +/-   ##
===========================================
+ Coverage    40.28%   40.33%   +0.04%     
===========================================
  Files           87       87              
  Lines        31591    31612      +21     
===========================================
+ Hits         12727    12751      +24     
+ Misses       18864    18861       -3     

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