Search dashboard: add scaffolding for Record Meter

[bluefuton]

Changes proposed in this Pull Request:

Add scaffolding for Record Meter feature in wp-admin's search dashboard.

Todo:

• Add feature flag

Jetpack product discussion

pcNPJE-iq-p2

Does this pull request change what data or activity we track or use?

No.

Testing instructions:

On a site with Instant Search enabled, load the search dashboard with features=record-meter in the query string:

wp-admin/admin.php?page=jetpack-search&features=record-meter

You should see the 'Your search records' title like shown:

Now try with some old nonsense in the features param, like spaniels, or omit the param altogether.

wp-admin/admin.php?page=jetpack-search&features=spaniels

You should not see the 'Your search records' title at all:

cc @annacmc

[github-actions]

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Jetpack plugin:

• Next scheduled release: March 1, 2022.
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[annacmc]

Gave this a spin and it's working as expected for me 👍

When I tried with no query string I could not see 'Your search records' title at all, nor when I added some other nonsense query strings such as features=spaniels

It does display Your search records correctly when I add features=record-meter

Gave it a test in Safari, Chrome & Firefox as well as firefox iOS on mobile. Works well in all cases 🎉

[jsnmoon]

Works as described, but will require a tweak to pass all the required checks.

[jsnmoon]

Re-approving following a lockfile update