Serialize numpy arrays with object types

[kt474]

Summary

Details and comments

Fixes Qiskit/qiskit-ibm-provider#74

[daka1510]

I'm not very familiar with the background on how encoding/deocing works here but based on what I read in the referenced issue and what I see in this PR it looks good :). Guess a secondary reviewer helps to gain more confidence.

[daka1510]

@rathishcholarajan though it looks good to me: can you take a quick look if we can integrate it?

[rathishcholarajan]

@kt474 Looks good. Could you update cloud-production URL to https://cloud.ibm.com in your fork to get rid of these errors https://github.com/kt474/qiskit-ibm-runtime/runs/5094722869?check_suite_focus=true#step:5:1029 and we can see if all integration tests pass before merging this?

[daka1510]

@kt474 the integration test jobs of the CI runs on your fork are still failing due to configuration issues
https://github.com/kt474/qiskit-ibm-runtime/actions/runs/1819857623

Can you check again? Feel free to reach out if you need help. More details are also available at https://github.com/Qiskit/qiskit-ibm-runtime/blob/main/CONTRIBUTING.md#configuration

[rathishcholarajan]

@kt474 Could you please resolve merge conflicts?

[rathishcholarajan]

LGTM!

[coveralls]

Pull Request Test Coverage Report for Build 1847984819

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• 189 unchanged lines in 17 files lost coverage.
• Overall coverage decreased (-5.3%) to 58.078%

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Files with Coverage Reduction	New Missed Lines	%
qiskit_ibm_runtime/accounts/account.py	1	93.02%
qiskit_ibm_runtime/ibm_backend.py	1	60.0%
qiskit_ibm_runtime/runtime_program.py	1	88.68%
qiskit_ibm_runtime/api/auth.py	2	74.19%
qiskit_ibm_runtime/utils/backend_decoder.py	2	47.54%
qiskit_ibm_runtime/api/clients/base.py	4	88.03%
qiskit_ibm_runtime/utils/converters.py	6	18.97%
qiskit_ibm_runtime/api/rest/program_job.py	9	60.87%
qiskit_ibm_runtime/api/rest/cloud_backend.py	11	37.5%
qiskit_ibm_runtime/api/session.py	11	70.54%

Totals
Change from base Build 1846800755:	-5.3%
Covered Lines:	2013
Relevant Lines:	3466

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💛 - Coveralls

[rathishcholarajan]

@kt474 Could you please backport this as well to qiskit-ibmq-provider?