docs: callresource by copilot

[sympatheticmoose]

What this PR does / why we need it:

Same as #1145

Prompt1:

you are a technical documentation writer. Given the files in this workspace, search for examples of CallResource in data source plugins.

Use this information to generate a how-to tutorial in markdown introducing the CallResource function for a Grafana data source plugins. What it is and what it can be used for (common use cases)

You can assume readers have an understanding of go and data source plugins

Prompt2:

replace the example implementation above with distinct examples for the 4 common use cases identified in the previous section

Prompt3:

suggest a better title to aid discovery of this tutorial for those that do not know CallResource is the function they should use

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

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✨ This PR can be merged. It will not be considered when calculating future versions of the npm packages and will not appear in the changelogs.