EZP-30462: Aligned Field Type service tags with new naming convention

[mikadamczyk]

Question	Answer
JIRA issue	EZP-30462
Improvement	yes
New feature	no
Target version	master
BC breaks	no
Tests pass	yes/no
Doc needed	yes

Tags used to register Field Type features in the dependency injection container should be consistent and follow Symfony convention (snake case)

ezpublish.fieldType => ezplatform.field_type
ezpublish.fieldType.indexable => ezplatform.field_type.indexable
ezpublish.storageEngine.legacy.converter => ezplatform.field_type.legacy_storage.converter
ezpublish.fieldType.parameterProvider => ezplatform.field_type.parameter_provider
ezpublish_rest.field_type_processor => ezplatform.field_type.rest.processor
ez.fieldFormMapper.value => ezplatform.field_type.form_mapper.value
ez.fieldFormMapper.definition => ezplatform.field_type.form_mapper.definition

Related PR:
ezsystems/repository-forms#292
ezsystems/ezpublish-kernel#2653

QA: We have to make sure that all field types work correctly

TODO:

• Fix new code according to Coding Standards ($ composer fix-cs).
• Ask for Code Review.

[micszo]

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