(PoC) feat: add _buildSrcSet static method

[luqven]

This PR is a WIP This PR is a stacked PR

PR	Title	Merges Into	diff
1	_buildURL	main	review this
2	_buildSrcSet 👈🏼	#287	review this
3	fix extractUrl	#288	review this

This PR adds a static method to ImgixClient, _buildSrcSet, that allow us to generate srcsets for 1-step, or full, URLs.

Future work

The type declarations make this more public than we may like. Could be in favor or removing them.

[commit-lint[bot]]

Features

• create extractUrl helper function (1ccc4a6)
• define _buildURL static method (9e6da88)
• add static buildSrcSet (c934400)

Tests

• create _buildURL unit tests (1ec0c84)
• add static buildSrcSet unit tests (4279145)

Chore

• remove sanitize option (2bddedf)

Build System

• add type declarations for static methods (80806b2)

Contributors

luqven

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[luqven]

Closing in favor of #294