loadtest: configure CR sizing and complexity

[SimonTheLeg]

Summary

Adds the ability to specify sizes, complexity and number of bindings per workspace to mimic real-world use-cases better.

Specifically this allows creation of synthetic RessourceSchemas and their corresponding Exports and Bindings as well as objects.

This PR is chunked in two distinc commits to make reviewing it a bit easier, as it is quite large.

What Type of PR Is This?

/kind feature

Release Notes

NONE

[kcp-ci-bot]

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[kcp-ci-bot]

@SimonTheLeg: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kcp-test-e2e-sharded	b72175e	link	true	/test pull-kcp-test-e2e-sharded
pull-kcp-test-e2e-sharded-embedded-vw	b72175e	link	false	/test pull-kcp-test-e2e-sharded-embedded-vw
pull-kcp-test-e2e	b72175e	link	true	/test pull-kcp-test-e2e

Full PR test history

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