Fix: Support bare multiplier words in English number recognition

[BegBedion]

Summary

This PR fixes issue #3208 by allowing recognition of bare multiplier words like 'hundred', 'thousand', 'million', etc. without requiring an explicit coefficient prefix.

Problem

Previously, the English number recognizer only recognized multiplier words when prefixed with a coefficient:

• ✓ 'one hundred dollars' → $100
• ✓ 'a hundred dollars' → $100
• ✗ 'hundred dollars' → Not recognized (should be $100)

This affected all NumberWithUnit models (Currency, Age, Temperature, etc.) since they depend on the Number extractor.

Solution

Modified the SeparaIntRegex pattern in Patterns/English/English-Numbers.yaml to add support for standalone round number words by including an alternative option ({RoundNumberIntegerRegex}).

The pattern now supports three cases:

1. Base numbers optionally followed by round numbers (e.g., 'twenty hundred')
2. Articles followed by round numbers (e.g., 'a hundred')
3. Standalone round numbers (e.g., 'hundred') - NEW

Changes

• Modified: Patterns/English/English-Numbers.yaml - Updated SeparaIntRegex definition

Testing

This change should be tested with:

• Recognition of bare multiplier words: 'hundred', 'thousand', 'million', 'billion', 'trillion'
• Combinations with currency: 'hundred dollars', 'thousand euros', 'million pounds'
• Combinations with other units through NumberWithUnit models
• Backward compatibility with existing patterns

Closes #3208