🚸 Improve lume-tooltip usability by introducing opened prop

[joao-m-santos]

Closes #395

📝 Description

• Added opened prop to lume-tooltip (defaults to false)
• Now adds/removes the animation class on Popper create/destroy (no more flying from the corner)

💥 Is this a breaking change (Yes/No):

• [x] No
• [ ] Yes (please describe the impact and migration path for existing Lume users)

Note: It still works the old way too (e.g. <lume-tooltip v-if="opened" />), but it's not recommended.

📝 Additional Information

Users can now do

<template #tooltip="tooltipProps">
  <lume-tooltip v-bind="tooltipProps">
    ...
  </lume-tooltip>
</template>

and it works out-of-the-box.

Before submitting the PR, please make sure you do the following

• [x] Read the Contributing Guidelines.
• [x] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• [x] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• [x] Ideally, include relevant tests that fail without this PR but pass with it.

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