Fix/arrowfunction with conditional expression body

[mdm317]

Summary

Closes #1805
I found an incompatibility issue with Prettier when using arrow functions which body is conditional expression

I found this issue occurs when formatting arrow functions whose body is conditional expression
see below example code when linewidth 17

(someProperty)=>someProperty?'one':'two'

playground

I found prettier enforce space after => this token in this case.
And I tried to implement this without changing to FormatElement but failed. So, I added a HardSpace to FormatElement to implement this.

I am not sure if this approach is acceptable.
Also Documenting can be quite challenging.

Please review my code

Test Plan

add test case

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[codspeed-hq]

CodSpeed Performance Report

Merging #1929 will improve performances by 9.79%

_{Comparing mdm317:fix/arrowfunction-with-conditional-expression-body (4d55426) with main (f73af5d)}

Summary

⚡ 1 improvements
✅ 92 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	mdm317:fix/arrowfunction-with-conditional-expression-body	Change
⚡	big5-added.json[uncached]	3.1 ms	2.8 ms	+9.79%

[ematipico]

The documentation that you wrote is amazing! Thank you for your contribution and the fix 🙏

[ematipico]

You need to fix the conflicts, then we can merge it