WIP: Add tryparse

[jakobnissen]

Still WIP

[codecov]

Codecov Report

❌ Patch coverage is 91.30435% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.43%. Comparing base (3de9d43) to head (c24e4aa).
⚠️ Report is 31 commits behind head on master.

Files with missing lines	Patch %	Lines
src/longsequences/constructors.jl	80.95%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #241      +/-   ##
==========================================
- Coverage   90.52%   90.43%   -0.09%     
==========================================
  Files          31       31              
  Lines        2395     2416      +21     
==========================================
+ Hits         2168     2185      +17     
- Misses        227      231       +4     

Flag	Coverage Δ
unittests	90.43% <91.30%> (-0.09%)	⬇️

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