refactor(toml): split symbol parser

[timreichen]

Dependent on #6538

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.54%. Comparing base (645875e) to head (efa7c79).
Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6563   +/-   ##
=======================================
  Coverage   94.54%   94.54%           
=======================================
  Files         580      580           
  Lines       43772    43793   +21     
  Branches     6480     6482    +2     
=======================================
+ Hits        41384    41404   +20     
- Misses       2345     2346    +1     
  Partials       43       43           

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[kt3k]

LGTM