Fix kafka avro wire format

[Licenser]

Pull request

Description

• remove schema registry preprocessor
• remove index lookup and schema registry lookup in avro codec
• add confluent_schema_registry codec for avro
• move pre and post-processors to tremor-interceptor
• add tremor-config

Checklist

• The RFC, if required, has been submitted and approved
• Any user-facing impact of the changes is reflected in docs.tremor.rs
• The code is tested
• Use of unsafe code is reasoned about in a comment
• Update CHANGELOG.md appropriately, recording any changes, bug fixes, or other observable changes in behavior
• The performance impact of the change is measured (see below)

Performance

[codecov]

Codecov Report

Merging #2356 (2d1aa1a) into main (92b1f0d) will increase coverage by 0.01%.
The diff coverage is 87.46%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2356      +/-   ##
==========================================
+ Coverage   90.87%   90.88%   +0.01%     
==========================================
  Files         279      281       +2     
  Lines       59553    59675     +122     
==========================================
+ Hits        54117    54238     +121     
- Misses       5436     5437       +1     

Flag	Coverage Δ
unittests	90.88% <87.46%> (+0.01%)	⬆️

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

Files	Coverage Δ
src/config.rs	98.35% <100.00%> (+0.04%)	⬆️
src/connectors/google.rs	88.70% <100.00%> (ø)
src/connectors/impls/bench.rs	86.78% <100.00%> (ø)
src/connectors/impls/cb.rs	90.70% <100.00%> (+0.16%)	⬆️
src/connectors/impls/clickhouse.rs	97.17% <100.00%> (ø)
src/connectors/impls/crononome.rs	95.60% <100.00%> (ø)
src/connectors/impls/dns/client.rs	82.56% <100.00%> (ø)
src/connectors/impls/elastic.rs	94.28% <100.00%> (ø)
src/connectors/impls/exit.rs	97.40% <100.00%> (ø)
src/connectors/impls/file.rs	91.79% <100.00%> (ø)
... and 99 more

... and 2 files with indirect coverage changes

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[mfelsche]

Some minor typoes, otherwise 👍

[Licenser]

All fixed :) thanks for the detailed review!