Refactor serialization of TOML data

[awvwgk]

Note: Breaking change of toml_serializer API

• toml_dump subroutine to write to a file or unit
• toml_dumps subroutine to write to a string
• toml_serialize function to return string

[codecov]

Codecov Report

Patch coverage: 15.87% and project coverage change: -0.89 ⚠️

Comparison is base (963082b) 67.02% compared to head (49e2b89) 66.14%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
- Coverage   67.02%   66.14%   -0.89%     
==========================================
  Files          29       29              
  Lines        3124     3155      +31     
  Branches     1310     1342      +32     
==========================================
- Hits         2094     2087       -7     
- Misses        376      390      +14     
- Partials      654      678      +24     

Impacted Files	Coverage Δ
src/tomlf/ser.f90	45.98% <15.87%> (-13.63%)	⬇️

... and 4 files with indirect coverage changes

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