chore: remove deprecated methods

[w1am]

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Pull Request Overview

This PR removes deprecated JSON serialization methods and updates test cases to directly serialize event data using byte arrays.

• Replace usage of deprecated methods with direct byte array serialization via ObjectMapper.
• Update test methods to reflect the new payload type and modify exception signatures accordingly.
• Remove deprecated methods from EventDataBuilder and EventData to streamline JSON handling.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/test/java/io/kurrent/dbclient/streams/MetadataTests.java	Updated payload serialization in metadata tests
src/test/java/io/kurrent/dbclient/samples/opentelemetry/Instrumentation.java	Updated JSON serialization with ObjectMapper
src/test/java/io/kurrent/dbclient/samples/appending_events/AppendingEvents.java	Updated event appending methods to use ObjectMapper serialization
src/main/java/io/kurrent/dbclient/EventDataBuilder.java	Removed deprecated JSON builder methods
src/main/java/io/kurrent/dbclient/EventData.java	Removed deprecated JSON builder method references

Comments suppressed due to low confidence (3)

src/test/java/io/kurrent/dbclient/streams/MetadataTests.java:30

• The test payload type was changed from a HashMap to a byte array. Verify that the test assertions and downstream consumers are updated to handle this payload format.

byte[] payload = "data".getBytes();

src/test/java/io/kurrent/dbclient/samples/appending_events/AppendingEvents.java:72

• [nitpick] The TestEvent payload in the appendWithNoStream method was modified from 'some other value' to 'some value'. Confirm that this change is intentional to maintain the intended test scenario.

objectMapper.writeValueAsBytes(new TestEvent("2", "some value")))

src/test/java/io/kurrent/dbclient/samples/appending_events/AppendingEvents.java:102

• [nitpick] In the concurrency test, the event id for client one changed from '1' to '2', making both client events have the same identifier. Ensure this change is deliberate as it may affect the concurrency validation logic.

objectMapper.writeValueAsBytes(new TestEvent("2", "clientOne")))