[feature][python-client]support python end to end encryption

[tuteng]

Motivation

After supporting end-to-end encryption for nodejs, consider supporting end-to-end encryption for python clients.

Modifications

• Add static method create for DefaultCryptoKeyReader
• Add ConsumerConfiguration_setCryptoKeyReader and ProducerConfiguration_setCryptoKeyReader
• Add class CryptoKeyReader
• Add python integration test

Verifying this change

• Add test

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API: (yes / no)
• The schema: (yes / no / don't know)
• The default values of configurations: (yes / no)
• The wire protocol: (yes / no)
• The rest endpoints: (yes / no)
• The admin cli options: (yes / no)
• Anything that affects deployment: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[sijie]

@BewareMyPower Can you also review this?

[tuteng]

cpp tls test failed

Handshake failed: certificate verify failed
Which is: Ok
[  FAILED  ] AuthPluginTest.testTls (111 ms)
[----------] 1 test from AuthPluginTest (111 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (111 ms total)
[  PASSED  ] 0 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] AuthPluginTest.testTls

[  FAILED  ] AuthPluginTest.testTlsDetectPulsarSsl (128 ms)
[----------] 1 test from AuthPluginTest (128 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (128 ms total)
[  PASSED  ] 0 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] AuthPluginTest.testTlsDetectPulsarSsl

[tuteng]

/pulsarbot run-failure-checks

[tuteng]

@merlimat PTAL

[tuteng]

/pulsarbot run-failure-checks

[tuteng]

/pulsarbot run-failure-checks

[tuteng]

ping @merlimat PTAL