[improve][txn][PIP-298] Consumer supports specifying consumption isolation level

[hzh0425]

PIP: #21114

Motivation

Consumer supports specifying consumption isolation level #21114

Modifications

Add a configuration 'SubscriptionIsolationLevel' in consumer builder:

PulsarClient client = PulsarClient.builder().serviceUrl("pulsar://localhost:6650").build();
Consumer<String> consumer = client.newConsumer(Schema.STRING)
        .topic("persistent://my-tenant/my-namespace/my-topic")
        .subscriptionName("my-subscription")
        .subscriptionType(SubscriptionType.Shared)
        .subscriptionIsolationLevel(IsolationLevel.READ_COMMITTED) // Adding the isolation level configuration
        .subscribe();

Verifying this change

• [x] Make sure that the change passes the CI checks.

(Please pick either of the following options)

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

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

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)
• [x] 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
• [x] doc-not-needed
• [ ] doc-complete

Matching PR in forked repository

PR in forked repository:

[hzh0425]

@liangyepianzhou pls cc

[hzh0425]

@codelipenghui

Hi, could you please help with the review as soon as possible? We are currently very urgent Thank you for your time