[runtime] Support async execution for cross language resources.

[wenjin272]

Linked issue: #448

Purpose of change

When invoking a Java method via Pemja from a Python async thread, if that Java method creates objects using reflection, a ClassNotFoundException may occur because the Python async thread lacks the necessary Java environment context.

In Flink agents, this issue occurs when the Python API calls a Java resource that depends on other Java resources in async thread. For example, the python chat model action call chat of a java chat model setup, and the setup will get the correspond chat model connection, which will construct the connection object by reflection.

To resolve this issue, this pr moves the construction of resources from chat/embed method to open, and the open will invoked in flink mailbox thread. Additionally, we have added a check similar to the one for memory: users are now prohibited from calling get_resource outside of a mailbox thread.

This patch depends on alibaba/pemja#95 in pemja. Therefore, we need to wait for the fix versions for Pemja and Flink 1.20, 2.0, 2.1, and 2.2.

Tests

existed e2e test for cross language resources

API

Yes. Add open for Resource

Documentation

• doc-needed
• doc-not-needed
• doc-included

[wenjin272]

After the code review is complete with no issues, I will add the corresponding documentation updates to this PR.