[Tabs] Add a function to set the tooltip text for a Tab

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**Is your feature request related to a problem? Please describe.**
The tooltip text for a tab can be set using `TooltipCompat.setTooltipText(tab.view, "Tooltip")`, however this text gets reset to the `Tab`'s text whenever the `Tab`'s layout changes and hence workarounds are required to change this text (listening to every `Tab`'s layout changes for example). The tooltip text may not always be the same as the `Tab`'s text, for example the text may be a short-form and the tooltip may want to display the full-form.

_Originally from https://github.com/material-components/material-components-android/issues/3621_

**Describe the solution you'd like**
A good solution to this would be to add a function (`TabLayout.Tab.setTooltipText()`) to set the tooltip text. If this function is not called then the tooltip text will fallback to the `Tab`'s text as it does currently.

**Describe alternatives you've considered**
As a workaround I've added a layout change listener to every single tab to set the tooltip text again.

```java
public static void mediateTabLayout(TabLayout tabLayout, ViewPager2 viewPager, String[] tabTexts, String[] tabDescriptions) {
new TabLayoutMediator(tabLayout, viewPager, (tab, position) -> {
tab.setText(tabTexts[position]);
tab.setContentDescription(tabDescriptions[position]);
TooltipCompat.setTooltipText(tab.view, tabDescriptions[position]);
}).attach();

for (int i = 0; i < tabLayout.getTabCount(); ++i) {
TabLayout.Tab tab = tabLayout.getTabAt(i);
int position = i;

if (tab == null) {
continue;
}

tab.view.addOnLayoutChangeListener((view, i0, i1, i2, i3, i4, i5, i6, i7) -> {
TooltipCompat.setTooltipText(view, tabDescriptions[position]);
});
}
}
```

**Additional context**
None.

Start at the TabLayout.Tab API and trace how a tab's tooltip currently follows its text during layout changes. Add the requested tooltip-setting behavior with the stated fallback to the tab text, then verify that the custom tooltip remains correct after layout changes.

Written by the indexing model from the issue text.