Add basic SASL and TLS support for Kafka cloud events

[Sovietaced]

Tracking issue

Closes https://github.com/flyteorg/flyte/issues/3220

Why are the changes needed?

These changes are needed to use cloud events with kafka brokers with password or certificate auth enabled.

What changes were proposed in this pull request?

This change expands the KafkaConfig struct to include some SASL fields for password based auth as well as a TLSConfig struct for certificate based auth. It then provides a helper function to load these into the Sarama config. Lastly it adds helm support for loading the cloud events config from a secret since password based auth will contain sensitive fields.

How was this patch tested?

This was tested on our production Flyte clusters.

Check all the applicable boxes

• [x] I updated the documentation accordingly.
• [x] All new and existing tests passed.
• [x] All commits are signed-off.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 11.11111% with 32 lines in your changes missing coverage. Please review.

Project coverage is 36.83%. Comparing base (553a702) to head (6d7a27f). Report is 143 commits behind head on master.

Files with missing lines	Patch %	Lines
...kg/runtime/interfaces/application_configuration.go	8.57%	29 Missing and 3 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5814      +/-   ##
==========================================
- Coverage   36.84%   36.83%   -0.02%     
==========================================
  Files        1309     1309              
  Lines      130967   130998      +31     
==========================================
- Hits        48259    48255       -4     
- Misses      78524    78557      +33     
- Partials     4184     4186       +2     

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.06% <11.11%> (-0.09%)	:arrow_down:
unittests-flytecopilot	11.73% <ø> (ø)
unittests-flytectl	62.40% <ø> (ø)
unittests-flyteidl	6.92% <ø> (ø)
unittests-flyteplugins	53.64% <ø> (ø)
unittests-flytepropeller	43.00% <ø> (ø)
unittests-flytestdlib	55.41% <ø> (ø)

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