Add UnnecessaryBackticks rule

[t-kameyama]

Fixes #4739

[vercel]

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Name	Status	Preview	Updated
detekt	✅ Ready (Inspect)	Visit Preview	Apr 25, 2022 at 8:05AM (UTC)

[codecov]

Codecov Report

Merging #4764 (5966655) into main (0380716) will increase coverage by 0.00%.
The diff coverage is 85.71%.

@@            Coverage Diff            @@
##               main    #4764   +/-   ##
=========================================
  Coverage     84.69%   84.69%           
- Complexity     3413     3425   +12     
=========================================
  Files           490      491    +1     
  Lines         11232    11253   +21     
  Branches       2065     2069    +4     
=========================================
+ Hits           9513     9531   +18     
- Misses          675      676    +1     
- Partials       1044     1046    +2     

Impacted Files	Coverage Δ
...urbosch/detekt/rules/style/UnnecessaryBackticks.kt	85.00% <85.00%> (ø)
...rturbosch/detekt/rules/style/StyleGuideProvider.kt	100.00% <100.00%> (ø)

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[BraisGabin]

Thanks!