feat: sticky tooltips

[ivan-aksamentov]

A prototype which aims to improve user experience around tooltips.

When clicked, on the aa mutation, these tooltips:

will now stick, so that information can be copied. The sticky tooltip can be closed by clicking away (outside the tooltip body).

There are probably many weird edge cases to handle.

Other tooltips are not affected (yet), but in principle they all can be made sticky. Will require a bit of refactoring.

Resolves https://github.com/nextstrain/nextclade/issues/734

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