[Feature] Add startsWith and endsWith utility functions

[titouanmathis]

This PR adds two new utility functions to tests if a string starts or ends with another string. Both new functions are more performant than the native String.prototype.startsWith and String.prototype.endsWith function, tested on Chrome, Firefox, and Safari with the following benchmarks:

• https://jsbench.me/1hlkqqd0ff/1
• https://jsbench.me/1hlkqqd0ff/2

import { startsWith, endsWith } from '@studiometa/js-toolkit/utils';

console.log(startsWith('foo', 'f')); // true
console.log(startsWith('foo', 'b')); // false

console.log(endsWith('foo', 'o')); // true
console.log(endsWith('foo', 'a')); // false

To-do

• Add documentation
• Update changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c335cec) 97.68% compared to head (af384e9) 97.69%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #389      +/-   ##
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+ Coverage    97.68%   97.69%   +0.01%     
===========================================
  Files           97       99       +2     
  Lines         2245     2257      +12     
  Branches       538      542       +4     
===========================================
+ Hits          2193     2205      +12     
  Misses          51       51              
  Partials         1        1              

Flag	Coverage Δ
unittests	97.69% <100.00%> (+0.01%)	⬆️

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[github-actions]

Export Size

@studiometa/js-toolkit

Name	Size	Diff
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startsWith	87 B	+87 B (+100.00%) 🔺
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FRAMEWORK	11.71 kB	+48 B (+0.41%) 🔺
ALL	15.78 kB	+55 B (+0.35%) 🔺

Unchanged

@studiometa/js-toolkit

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