Share number based field mapper test code with other modules

Move number based field mapper test infrastructure to the test framework module. This would allow other number based field mapper to use the same test infrastructure that the core number field mappers are using.

Currently UnsignedLongFieldMapper and ScaledFloatFieldMapper have their own concrete tests, but could instead make use of NumberFieldMapperTests or WholeNumberFieldMapperTests. This avoids duplicates tests and testing logic.

Furthermore this can avoid that non core field mappers don't get forgotten when new features / behaviour is added to core field mappers.

Originates from #92917