chore(DesignTokens): Improve performance of TokensTable story

What does this MR do?

chore(DesignTokens): Improve performance of TokensTable story

The TokensTable story was rendering all tokens at once, which is over 1,000 rows. This had quite poor performance, and made interacting with the table unpleasant. This was worsened by the lack of debounce on the search field.

This commit improves performance by:

• debouncing on the search field, so re-renders aren't triggered on every key press;
• paginating tokens, so they're not all rendered at once.

It also improves the searching behaviour by using fuse.js to do fuzzy searching, rather than the basic filtering provided by GlTable:

• searches are fuzzy, so exact substring matches are no longer required;
• results are sorted by closeness to the query (see https://www.fusejs.io/concepts/scoring-theory.html);
• only the name, value, description and deprecated fields are now searched, previously all were (see https://bootstrap-vue.org/docs/components/table#filtering);
• the standard GlSearchBoxByType component is used for the search input, providing a search icon and clear button.

Finally, this switches to a fixed table layout, which is generally faster for the browser to render, and makes sure the value column text wraps if needed.

Screenshots or screen recordings

Before	After
simplescreenrecorder-2025-01-22_17.07.32	simplescreenrecorder-2025-01-23_14.03.37

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• If it changes a Pajamas-compliant component's look & feel, the MR has been reviewed by a UX designer.
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Accessibility

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