feat(Flex): add gap support

[kmcfaul]

What: Closes #8397

Adds gap, rowGap, and columnGap to Flex with breakpoints.
Adds examples & updates tests.

@mcoker The issue mentions a plain pf-m-gap class (without the size or breakpoints) that I don't see on the modifiers list, so I left it out for now. Did I miss something?

[kmcfaul]

Not sure why a Datepicker snapshot is failing here, should I update it?

Edit: rebase should fix it

[patternfly-build]

Preview: https://patternfly-react-pr-9122.surge.sh

A11y report: https://patternfly-react-pr-9122-a11y.surge.sh

[tlabaj]

looks good. Just a couple of nits.

I noticed that core has some text about spacing should we also have that here? Or should there be a follow up content issue @mcarrano @edonehoo ?

[mcarrano]

@tlabaj this looks good as far as I can tell. Regarding your comment about documentation, not sure what the core docs say, but agree that having some explanatory text for these examples would be helpful. If that can't be added quickly here, I'm OK to open a follow-up issue.

[tlabaj]

@tlabaj this looks good as far as I can tell. Regarding your comment about documentation, not sure what the core docs say, but agree that having some explanatory text for these examples would be helpful. If that can't be added quickly here, I'm OK to open a follow-up issue.

@mcarrano here is a link to the core content I was referring to https://pf5.patternfly.org/layouts/flex#spacing.

[mcarrano]

I agree then that we should duplicate that documentation on the React page.

[mcoker]

it's beautiful! I created this core PR to enable the gap spacers without a size suffix (but can still be used with breakpoint suffix), not sure if we want to update this PR with that change or handle that as a follow-up after the core PR merges - patternfly/patternfly#5578

[tlabaj]

This looks good. I am going to open up a follow up issue for content. I think the docs could be better organized and align more with Core docs.

[tlabaj]

it's beautiful! I created this core PR to enable the gap spacers without a size suffix (but can still be used with breakpoint suffix), not sure if we want to update this PR with that change or handle that as a follow-up after the core PR merges - patternfly/patternfly#5578

We can open follow up.