Simpler constructors

[p14n]

Summary by Sourcery

Introduce simpler constructors for LocalPersistentConsumer and ConsumerServer which automatically configure database connections and executors.

Enhancements:

• Add constructors to LocalPersistentConsumer and ConsumerServer that create and manage default database connection pools and executors based on the provided configuration.

Documentation:

• Add a new section to the README demonstrating in-process usage with LocalPersistentConsumer.
• Update README examples to use the new simplified constructors.
• Update performance latency figures in the README.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces simpler constructors for LocalPersistentConsumer and ConsumerServer. The new constructors automatically handle the creation of the database connection pool, reducing the boilerplate code required for instantiation. The documentation in README.md has been updated to reflect these changes and provide clearer examples.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added simpler constructors to consumer classes.	Added a new constructor to LocalPersistentConsumer that takes PostEventConfig and OpenTelemetry. Added a new constructor to ConsumerServer that takes ConfigData and OpenTelemetry. The new constructors internally create the database connection pool using DatabaseSetup.createPool.	library/src/main/java/com/p14n/postevent/LocalPersistentConsumer.java library/src/main/java/com/p14n/postevent/ConsumerServer.java
Updated README.md with new constructors and clearer examples.	Added distinct sections for in-process and across-servers modes. Updated code examples for LocalPersistentConsumer, ConsumerServer, and RemotePersistentConsumer to use the new constructors. Adjusted configuration details in the code examples. Refined the description of performance latency.	README.md

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[sourcery-ai]

Hey @p14n - I've reviewed your changes - here's some feedback:

Overall Comments:

• The README example for LocalPersistentConsumer appears to use a different constructor signature than the one added in the code.
• The new constructors implicitly create a DataSource; consider if users might want to provide their own existing DataSource instance for more flexibility.

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

issue (typo): Typo: Duplicate 'ms' unit.

Remove the extra 'ms' unit.

Suggested change

	- Latency: < 50ms ms from topic publish to remote client receive in transaction
	- Latency: < 50ms from topic publish to remote client receive in transaction