feat: Add SequenceBottomNavigationSlot for customizable sequence navigation

[xitij2000]

Introduces a new plugin slot (SequenceBottomNavigationSlot) for extending or replacing the default bottom navigation in course sequences.

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@@            Coverage Diff             @@
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[brian-smith-tcril]

I debated quite a few things when thinking through how to make this more DRY.

The first thing that came to mind was moving this logic into renderUnitNavigation, and I also considered removing renderUnitNavigation's isAtTop param, but the fact that it's a pluginProp in UnitTitleSlot

frontend-app-learning/src/plugin-slots/UnitTitleSlot/index.jsx

Line 24 in db18c2c

renderUnitNavigation,

makes that risky.

I do still think we can make this more DRY without changing the existing slot prop API by doing something like:

  // before renderUnitNavigation
  const unitNavigationProps = {
    courseId,
    sequenceId,
    unitId,
    onClickPrevious: () => {
      logEvent('edx.ui.lms.sequence.previous_selected', 'bottom');
      handlePrevious();
    },
    onClickNext: () => {
      logEvent('edx.ui.lms.sequence.next_selected', 'bottom');
      handleNext();
    },
  };

  const renderUnitNavigation = (isAtTop) => (
    <UnitNavigation {...unitNavigationProps} isAtTop={isAtTop} />
  );

  {unitHasLoaded && (
    <SequenceBottomNavigationSlot
      {...unitNavigationProps}
      onNavigate={onNavigate}
    />
  )}

[xitij2000]

This is definitely the cleaner way to do things. I will try to apply the changes tomorrow.

[brian-smith-tcril]

These should match the prop names being spread in from unitNavigationProps

Suggested change

	nextHandler,
	onNavigate,
	previousHandler
	onClickPrevious,
	onNavigate,
	onClickNext