Add ability to set subject name strategies

[mpyatishev]

Unfortunately, PR #502 stalled for a long time. So I decided to make my humble attempt to solve this problem.
With this patch, you can set the Subject Name Strategy in CachedSchemaRegistryClient , for example:

client = CachedSchemaRegistryClient({
  'url': 'http://localhost',
  'key.subject.name.strategy': "TopicRecordNameStrategy",
  'value.subject.name.strategy': "TopicRecordNameStrategy",
})

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It looks like @mpyatishev hasn't signed our Contributor License Agreement, yet.

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[mpyatishev]

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[mpyatishev]

Can anybody review this PR?

[mpyatishev]

How can I restart the AppVeyor build if the problem is not in my code?

[mpyatishev]

@rnpridgeon , can you review my fixes for your changes request?

[agates4]

@mpyatishev thank you very much for this PR. I hope that this gets approved and merged. This is a problem that is blocking our org.

[agates4]

@rnpridgeon please review

[agates4]

@edenhill please review

[edenhill]

I believe @rnpridgeon 's PR #787 will add support for this in some form.

[mpyatishev]

It seems like I should close this PR in favor of #787