[OUDS] Docs: add 'Utilities > Object fit' page

[louismaximepiton]

Related issues

Listed in #2589.

Description

This PR adds the "Utilities > Object fit" page based on:

• the previous corresponding Boosted page (see code source)
• the corresponding Bootstrap page (see code source)

The remaining code will be added once the responsive part of the CSS is added in the OUDS Web CSS.
.rounded could be reintegrated if rounded is imported in OUDS Web

Types of change

• New documentation (non-breaking change which adds functionality)

Live previews

• https://deploy-preview-2663--boosted.netlify.app/docs/0.0/utilities/object-fit/

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