AWS Bedrock tests + serialization/deserialization tests for Bedrock providers

[aozherelyeva]

1. Added tests for serialization and deserialization of requests to Bedrock from different sub-providers;
2. Added AWS_SECRET_KEY and AWS_ACCESS_KEY_ID env variables to the environment variables of integration tests' run;
3. Add a test for simpleBedrockExecutor.

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Type of the change

• New feature
• Bug fix
• Documentation fix
• New tests

Checklist for all pull requests

• The pull request has a description of the proposed change
• I read the Contributing Guidelines before opening the pull request
• The pull request uses develop as the base branch
• Tests for the changes have been added
• All new and existing tests passed

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• An issue describing the proposed change exists
• The pull request includes a link to the issue
• The change was discussed and approved in the issue
• Docs have been added / updated

[github-actions]

Qodana for JVM

345 new problems were found

Inspection name	Severity	Problems
Check Kotlin and Java source code coverage	🔶 Warning	251
Missing KDoc for public API declaration	🔶 Warning	77
Unused import directive	🔶 Warning	13
Vulnerable imported dependency	🔶 Warning	4

@@ Code coverage @@
+ 63% total lines covered
7323 lines analyzed, 4648 lines covered
# Calculated according to the filters of your coverage tool

☁️ View the detailed Qodana report

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