chore!: Modify Oracle numeric data types

[joc-a]

Description

Detailed description:

• What:
  The SQL type of some Oracle and H2 Oracle numeric types were changed.
• Why:

1. To not take up more space than needed
2. It is a preparation step for making detecting column type change for migration easier

Next step: Do the same thing for the Integer and Long type, but I decided to proceed without it as there are some issues I must solve with SQLite first.

⚠️ Please review commit by commit because I will not squash the commits when merging.

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Type of Change

Please mark the relevant options with an "X":

• Bug fix
• New feature
• Documentation update
• Improvement

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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