Add new validator registration endpoint to beacon api spec

[xenowits]

Problem to be solved

We need to add a new endpoint for validator registrations to the beacon api spec. See design doc for more details.

Proposed solution

Add a new endpoint /eth/v2/validator/register_validator to the beacon API spec. See step 2 of design doc. Also, see the first attempt to add the endpoint here.

Out of Scope

None.

[thomasheremans]

Story Points: 5 See the discussion in Ongoing Sizing

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