Update how type information is passed from Phlex to FORM

[pcanal]

Given that ROOT knows about the type via their std::type_info (and their C++ names) and that we can not lookup a std::type_info from an std::type_index (but the reverse is supported by the C++ standard), we need to pass around the type_info (otherwise we need to build a map of supported types).

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 26 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
form/root_storage/root_tbranch_container.cpp	24.13%	19 Missing and 3 partials ⚠️
form/storage/storage.cpp	57.14%	2 Missing and 1 partial ⚠️
form/storage/storage_container.cpp	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (50.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (75.08%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

@@            Coverage Diff             @@
##             main     #252      +/-   ##
==========================================
- Coverage   76.66%   75.08%   -1.58%     
==========================================
  Files         124      124              
  Lines        2725     2906     +181     
  Branches      475      510      +35     
==========================================
+ Hits         2089     2182      +93     
- Misses        442      503      +61     
- Partials      194      221      +27     

Flag	Coverage Δ
unittests	75.08% <50.00%> (-1.58%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
form/form/form.cpp	74.19% <100.00%> (-2.95%)	⬇️
form/form/form.hpp	100.00% <ø> (ø)
form/form_module.cpp	85.10% <100.00%> (-2.40%)	⬇️
form/persistence/ipersistence.hpp	100.00% <ø> (ø)
form/persistence/persistence.cpp	84.31% <100.00%> (ø)
form/persistence/persistence.hpp	100.00% <ø> (ø)
form/root_storage/root_tbranch_container.hpp	100.00% <ø> (ø)
form/root_storage/root_ttree_container.cpp	46.15% <ø> (ø)
form/storage/istorage.hpp	100.00% <ø> (ø)
form/storage/storage.hpp	100.00% <ø> (ø)
... and 5 more

... and 5 files with indirect coverage changes

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