refactor: remove ActiveSupport dependency

[matteoredz]

This PR aims at removing it by replacing AS methods with plain Ruby ones.

ActiveSupport#parameterize vs I18n.transliterate

Warming up --------------------------------------
slugged with I18n transliterate
                        15.744k i/100ms
slugged with ActiveSupport parameterize
                        14.699k i/100ms
Calculating -------------------------------------
slugged with I18n transliterate
                        157.087k (± 0.9%) i/s -    787.200k in   5.011649s
slugged with ActiveSupport parameterize
                        146.142k (± 1.0%) i/s -    734.950k in   5.029510s

Comparison:
slugged with I18n transliterate:   157087.1 i/s
slugged with ActiveSupport parameterize:   146142.0 i/s - 1.07x  slower

ActiveSupport#parameterize vs custom Transliterator

Warming up --------------------------------------
slugged with a custom Transliterator
                        16.636k i/100ms
slugged with ActiveSupport parameterize
                        14.851k i/100ms
Calculating -------------------------------------
slugged with a custom Transliterator
                        166.378k (± 0.3%) i/s -    848.436k in   5.099480s
slugged with ActiveSupport parameterize
                        148.417k (± 0.4%) i/s -    742.550k in   5.003193s

Comparison:
slugged with a custom Transliterator:   166378.0 i/s
slugged with ActiveSupport parameterize:   148417.2 i/s - 1.12x  slower

To Do

• Check if replicating just the HashTransliterator could be enough to avoid including I18n as dependency