feat(text, collections): Added missing functions for collections and text modules

[hey-amanthakur]

Added groupBy, shuffle, range, difference, flatten, countBy

• groupBy(array, keyFn): Groups elements by a key function into a
  Record<K, T[]>. The most requested collection utility across all
  ecosystems (Lodash, Kotlin, etc.).

• shuffle(array): Returns a new array with elements randomly permuted
  using the Fisher-Yates algorithm. Does not mutate the input.

• range(startOrEnd, end?, {step?}): Generates a sequence of numbers
  from start (default 0) up to but not including end. Auto-detects
  direction (ascending/descending) when step is omitted.

• difference(a, b): Returns elements present in array a but not in
  array b. Uses a Set for O(n) lookup performance.

• flatten(array): Flattens an array of arrays one level deep into a
  single array. Does not perform recursive deep flattening.

• countBy(array, keyFn): Counts occurrences of each key returned by
  the key function, returning a Record<K, number>.

---

Added capitalize, stripAnsi, isAlpha, isNumeric, isAlphanumeric, escapeHtml, unescapeHtml

• capitalize(input): Capitalizes the first character and lowercases
  the rest of the string.

• stripAnsi(input): Removes ANSI escape codes from terminal strings
  using a comprehensive regex covering SGR, cursor, and control sequences.

• isAlpha(input): Checks if a string contains only ASCII alphabetic
  characters (A-Z, a-z).

• isNumeric(input): Checks if a string contains only ASCII numeric
  characters (0-9).

• isAlphanumeric(input): Checks if a string contains only ASCII
  alphanumeric characters (A-Z, a-z, 0-9).

• escapeHtml(input): Escapes HTML special characters (&, <, >, ", ')
  using named and numeric character references.

• unescapeHtml(input): Reverses HTML entity escaping, converting
  named entities and numeric references back to original characters.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.01%. Comparing base (ad7c87b) to head (0d81869).

Additional details and impacted files

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##             main    #7229    +/-   ##
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  Coverage   95.00%   95.01%            
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  Files         617      621     +4     
  Lines       51674    51472   -202     
  Branches     9326     9291    -35     
========================================
- Hits        49093    48905   -188     
+ Misses       2038     2029     -9     
+ Partials      543      538     -5     

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[babiabeo]

Thanks for drafting this. Here's my feedback:

• groupBy: Redundant. It was previously removed. Superseded by Object.groupBy(). See:
  • BREAKING(collections): deprecate groupBy() #3663
  • BREAKING(collections): remove groupBy() #3923
• shuffle: Redundant. Already covered by @std/random/shuffle.
• difference: Unecessary. Can be superseded by Set.difference().
• flatten: Redundant. Superseded by Array.flat().
• capitalize: Redundant. Already covered by @std/text/toPascalCase, @std/text/toSentenceCase, and @std/text/toTitleCase.
• stripAnsi: Redundant. Already covered by @std/fmt/colors/stripAnsiCode.
• escapeHtml/unescapeHtml: Redundant. Already covered by @std/html.

[hey-amanthakur]

Hi @babiabeo,

Thank you for taking the time to review my PR. I've made the requested changes, could you please take another look when you have a chance?