[improve][client] Deprecate MessageIdUtils.getOffset and MessageIdUtils.getMessageId

[RobertIndie]

Motivation

After discussing here, the pulsar client shouldn't expose the offset term to users.

Modifications

• Deprecate MessageIdUtils.getOffset and MessageIdUtils.getMessageId
• For connectors, use FunctionCommon.getOffset and FunctionCommon.getMessageId

Verifying this change

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

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

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 73.17%. Comparing base (bbc6224) to head (3825d6b).
Report is 290 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #22747      +/-   ##
============================================
- Coverage     73.57%   73.17%   -0.40%     
+ Complexity    32624    32560      -64     
============================================
  Files          1877     1889      +12     
  Lines        139502   141419    +1917     
  Branches      15299    15518     +219     
============================================
+ Hits         102638   103486     +848     
- Misses        28908    29936    +1028     
- Partials       7956     7997      +41     

Flag	Coverage Δ
inttests	27.54% <ø> (+2.96%)	⬆️
systests	24.60% <ø> (+0.27%)	⬆️
unittests	72.18% <0.00%> (-0.67%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
.../org/apache/pulsar/client/util/MessageIdUtils.java	0.00% <ø> (-88.89%)	⬇️
...r/io/kafka/connect/PulsarKafkaSinkTaskContext.java	0.00% <0.00%> (-64.04%)	⬇️

... and 352 files with indirect coverage changes