[IOAPPX-353] Add the new FooterActions (from io-app) and FooterActionsInline

[dmnplb]

Short description

This PR adds the new FooterActions (migrated from io-app) and the new FooterActionsInline, which replaces the legacy FooterWithButtons. So if you want to add actions to the footer you have several options:

• If you need a single button, just use FooterActions with the SingleButton type
• If you need two buttons, depending on your needs:
  • use FooterActions as recommended in the official guidelines
  • for special reasons (e.g. you need to save space), use FooterActionsInline to render both buttons on the same line
• If you need three buttons, just use FooterActions with the ThreeButtons type

Both FooterActions and FooterActionsInline come with two hooks, useFooterActionsMeasurements and useFooterActionsInlineMeasurements respectively, to get the safeBottomAreaHeight value to apply to the ScrollView's paddingBottom

List of changes proposed in this pull request

• Add the new FooterActions and FooterActionsInline and relative hooks
• Add the new demo screens to the example app
• Add the new IOSpacing object with the common spacing constants
• Update the deprecation note to FooterWithButtons
• Add the deprecation note to BlockButtons

Preview

footer-actions-inline-demo.mp4

How to test

1. Launch the example app
2. Go to the FooterActions… screens