✨ Add update event for hoveredIndex

[joao-m-santos]

Closes #394

📝 Description

Added an update event for hoveredIndex (update:hoveredIndex) so that users can two-way bind this property.

Vue 2 example:

<lume-line-chart v-bind:hoveredIndex.sync="customIndex" />

<script setup>
const customIndex = ref(-1);
</script>

Vue 3 example:

<lume-line-chart v-model:hoveredIndex="customIndex" />

<script setup>
const customIndex = ref(-1);
</script>

💥 Is this a breaking change (Yes/No):

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

📝 Additional Information

• Updated charts to also inherit attributes ($attrs) - needed to properly listen to update:* event(s)
• Added a playground Story and updates the synced tooltips Story

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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