docs: Firing custom GraphQL queries using Apollo client

[Pathan-Amaankhan]

What

• This PR will add doc for: how to fire custom GraphQL queries using Apollo client.

Related Issue(s):

• https://github.com/rtCamp/headless/issues/314

Testing Instructions

• Open docs/mutating-data.md and verify that the content is complete and accurate.

Screenshots

Additional Information

• Currently there is no way to fire query using @snapwp/query package. We will have to expose a query function in @snapwp/query package for the same.

Checklist

• I have read the Contribution Guidelines.
• My code is tested to the best of my abilities.
• My code passes all lints (ESLint, tsc, prettier etc.).
• My code has detailed inline documentation.
• I have added unit tests to verify the code works as intended.
• I have updated the project documentation as needed.
• I have added a changeset for this PR using npm run changeset.

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[justlevine]

This is perfect - thanks @Pathan-Amaankhan .

I'm not merging this, since it essentially says "if you want to query graphql data, use whatever you want and dont interface with our app".

We'll backfill this as we make progress on improving the DX here for the next sprint.