Feature/number formatter with optional exponential separator

[dedeibel]

NumberFormatterImpl works nicely but I wanted to be able provide a separator character before the exponent part. A good character would be NARROW NO-BREAK SPACE (0x202f). The current implementation does not allow a separator character and also only works with ASCII chars.

I tried to extend it to be able to use UTF-8 charset. The original implementation was clearly optimized for performance and I don't think this would be impacted by the change. If no UTF-8 character is used, there should be almost no change in runtime. No default separator is used and the overall default behaviour unchanged.

Please consider the change for integration.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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