fix: EXPOSED-707 Handle MariaDB fractional seconds support since version 5.3

[joc-a]

Detailed description:

• What:

1. Handle MariaDB fractional seconds support since version 5.3.
2. Fixed mistake in KDocs referring to JDBC connector version instead of database version.
3. Fixed isVersionCovers function to handle comparison of 8.0 with 5.6.
4. Made the MariaDBDialect class extendable to be consistent with other dialect classes.

• Why:
  According to the documentation here, MariaDB introduced fractional seconds support in temporal data types from version 5.3. For MySQL, it's from version 5.6. Previously, Exposed was assuming it was 5.6 for both MariaDB and MySQL.
• How:
  Modified isFractionDateTimeSupported in MysqlDialect to be open and overrided it in MariaDBDialect to return the correct result for MariaDB 5.3 onwards.

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Type of Change

Please mark the relevant options with an "X":

• Bug fix
• New feature
• Documentation update

Updates/remove existing public API methods:

• Is breaking change

Affected databases:

• MariaDB
• Mysql5
• Mysql8
• Oracle
• Postgres
• SqlServer
• H2
• SQLite

Checklist

• Unit tests are in place
• The build is green (including the Detekt check)
• All public methods affected by my PR has up to date API docs
• Documentation for my change is up to date

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