Convert the update.inc file functions to a class pt1

Followup #2999721: [META] Deprecate the legacy include files before Drupal 9 →

Problem/Motivation

Avoid handling of update.in file include and leave that task for autoloader.

This ticket will cover
update_fix_compatibility()
update_check_incompatibility
update_system_schema_requirements

Proposed resolution

Convert functions of update.inc to a class.

Remaining tasks

TBD

User interface changes

none

API changes

Deprecation of the update_* functions from update.inc file.
New Update class.

Data model changes

none