Removes SymbolTable and Catalog from the public API

[zslayton]

Removes the SymbolTable and Catalog/MapCatalog types from the public API. Also marks any mutating methods on SymbolTable as pub(crate); users do not need to modify the symbol table.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (ef641f4) 82.45% compared to head (95717a2) 82.45%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #602   +/-   ##
=======================================
  Coverage   82.45%   82.45%           
=======================================
  Files         111      111           
  Lines       20029    20032    +3     
  Branches    20029    20032    +3     
=======================================
+ Hits        16515    16518    +3     
  Misses       1896     1896           
  Partials     1618     1618           

Impacted Files	Coverage Δ
src/binary/binary_writer.rs	64.67% <ø> (ø)
src/lib.rs	0.00% <ø> (ø)
src/system_reader.rs	69.37% <ø> (ø)
src/text/text_writer.rs	75.65% <ø> (ø)
src/symbol_table.rs	91.66% <100.00%> (+0.36%)	⬆️

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