[FlowLayout] Deprecate FlowRow and FlowColumn

[uchennafokoye]

…owRow and FlowColumn in Androidx.Compose Foundations.

FlowLayouts is now supported in Androidx.Compose. Provided is a migration guide to move to the official version.

Please add the library name to the PR title. Example: "[Insets] Fixes typo"

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[cbeyls]

Currently the new FlowRow doesn't support verticalArrangement (only verticalAlignment) and the new FlowColumn doesn't support horizontalArrangement (only horizontalAlignment). This makes it impossible to add spacing between each row/column. Until this is supported, this version should not be deprecated.

[uchennafokoye]

Currently the new FlowRow doesn't support verticalArrangement (only verticalAlignment) and the new FlowColumn doesn't support horizontalArrangement (only horizontalAlignment). This makes it impossible to add spacing between each row/column. Until this is supported, this version should not be deprecated.

This has been fixed in the coming release. Please see more information here:
https://b.corp.google.com/issues/268365538

[alexvanyo]

Looks good to me!