add endpoint to match python status endpoint

[mwm5945]

What this PR does / why we need it:
Adds a matching endpoint to the executor such that the status endpoint is consistent across single node graphs without the executor, and ones with the executor.

Which issue(s) this PR fixes:

Fixes #3705

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Add status path to match the python microservice path

[seldondev]

Hi @mwm5945. Thanks for your PR.

I'm waiting for a SeldonIO or todo member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[seldondev]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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To complete the pull request process, please assign axsaucedo
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[mwm5945]

@axsaucedo or @cliveseldon any thoughts on this? seems simple enough to have a consistent status endpoint :)

[ukclivecox]

@mwm5945 Seems good.

[mwm5945]

cool! i've been having some issues getting kafka libs to compile on apple M1 silicon, do you have any tips? (i could always mount it in a docker container)

[ukclivecox]

cool! i've been having some issues getting kafka libs to compile on apple M1 silicon, do you have any tips? (i could always mount it in a docker container)

Most of us don't use Mac. Maybe open a separate issue for this with the error?

[axsaucedo]

/test integration

[seldondev]

@mwm5945: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
integration	532d1a4	link	/test integration

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