Check Setup::MINIMUM_DB_VERSION, refs 4439, 4438

[mwjames]

This PR is made in reference to: #4439, #4438

This PR addresses or contains:

• Setup::MINIMUM_DB_VERSION contains the min requirement definition
• SetupCheck/Installer will examine the MINIMUM_DB_VERSION (is required for a different PR that needs to raise the minimum for postgres/sqlite)
• Setup::MINIMUM_DB_VERSION has been added to the upgrade key (see SetupFile::makeKey) which means anytime the definition is altered, a new upgrade key will be necessary and ensures that update.php/setupStore.php is run first to check and inform users in case the requirement isn't met hereby blocks SMW (as below)

This PR includes:

• Tests (unit/integration)
• CI build passed

Example

Command line

$ php maintenance/setupStore.php

Semantic MediaWiki:                                             3.2.0-alpha
MediaWiki:                                                           1.33.1

--- Database setup --------------------------------------------------------

Storage engine:                                                SMWSQLStore3

--- Compatibility notice --------------------------------------------------

The postgres database version of 9.6.16 doesn't meet the minimum
requirement of 19.2 for Semantic MediaWiki.

The installation of Semantic MediaWiki was aborted!

Web