Solace Read connector: adding implementations of SempClient and SempClientFactory

[bzablocki]

This is the 4th PR for the Solace Read connector (addresses #31440). It depends on the #31541, #31539 and #31476 (root).

The files that are added/modified in this PR, comparing to the #31541:

• build.gradle
• BasicAuthSempClient.java
• BasicAuthSempClientFactory.java
• BrokerResponse.java
• SempBasicAuthClientExecutor.java
• Semp.java
• package-info.java
• SerializableSupplier.java
• SempBasicAuthClientExecutorTest.java

Quick Link to see only the modified files: https://github.com/apache/beam/pull/31542/commits/43adbb7b06fde01aa126a8999cdad318c03069c4

These are implementations of SempClient and SempClientFactory. SempClientFactory can be used as an argument to SolaceIO.Read.withSempClientFactory(...).

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