Allow to convert a type to a floating point

[Baptouuuu]

Context

Initially Formal didn't support floats to prevent people to use this type to store data in an unsafe way (like money for example), due to multiple bugs that may arise.

But in some cases we do need to store values as floats. For example one may want to duplicate a value to an approximation and allow to search on this approximation.

One of these cases would be a system where you let users input any float value and store it as a string so the value never changes and duplicate this property as a decimal to only support search up to a certain decimal part.

Solution

Allow Formal\ORM\Definition\Type to handle the float type.

Notes

No Formal\ORM\Definition\Type\FloatType is created to prevent introducing implicits in converting the floats from the storage level.

This forces users to create their own type and know which type to use in the storage.

Bugs born out of implicits can't be universally fixed by an abstraction, it's up to each app to handle them.

---

Even though the diff is small this will be released as a new major version since technically it's a BC break.

[codecov]

Codecov Report

Attention: Patch coverage is 94.87179% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.22%. Comparing base (0b1ed42) to head (020b51e).
Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Definition/Type/IntType.php	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop      #42   +/-   ##
==========================================
  Coverage      97.21%   97.22%           
  Complexity       637      637           
==========================================
  Files             96       96           
  Lines           4351     4359    +8     
==========================================
+ Hits            4230     4238    +8     
  Misses           121      121           

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