[GSOC'24 Amharic chapter] Implement Date time parser for Ethiopian Calendar

[Meti-Adane]

• Implements Ethiopian date to Gregorian calendar conversion for Amharic extractions.
• Implements Geez number to Arabic numeral conversion for dates written in geez number.
• Address concern mentioned in Issue 761

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
11.0% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud