[R20-1463] add custom loading indicator

[lambry]

Issue: https://digital-vic.atlassian.net/browse/R20-1463

What I did

• Nuxt recently made a change (fix(nuxt): stop indicator when not changing page component nuxt/nuxt#21656) that meant the loading indicator no-longer works for us, so this adds our own TideLoadingIndicator

Checklist

For all PR's

• I've added relevant changes to the project Readme if needed.
• I've updated the documentation site as needed.
• I have added unit tests to cover my changes (if not applicable, please state why in a comment)

For new components only

• I have added a story covering all variants
• I have checked a11y tab in storybook passes
• Any events are emitted on the event bus

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