Update: Improve report location for template-curly-spacing

[mdjermanovic]

Prerequisites checklist

• I have read the contributing guidelines.
• The team has reached consensus on the changes proposed in this pull request. If not, I understand that the evaluation process will begin with this pull request and won't be merged until the team has reached consensus.

What is the purpose of this pull request? (put an "X" next to item)

[X] Other, please explain:

Changes template-curly-spacing report locations.

What changes did you make? (Give an overview)

• For missing spaces the rule will now report the full location of ${ or }
• For disallowed spaces the rule will now report the location of spaces (the range that should be removed).

"always" before this change:

"always" after this change:

"never" before this change:

"never" after this change:

Also:

• Refactoring - locations are now also different depending on the option, so the code became difficult to follow with two branches in every line.
• Replaced regexes with .startsWith() and .endsWith().
• Replaced call to deprecated isSpaceBetweenTokens with isSpaceBetween

Is there anything you'd like reviewers to focus on?

• Refactoring.
• Checks whether prevToken/nextToken exists or not are removed. I believe they were not necessary (in the previous version as well) when the template token starts/ends with }/${.

Marked as an enhancement, as suggested in a similar PR (I agree), but I guess it can be accepted as a bug fix.

[mdjermanovic]

Marked as accepted since it refs #12334

[kaicataldo]

LGTM, thanks!