Implementation for logs in plugin

[deepikaSingh2711]

Describe your changes

This PR adds consistent logging across the SDM Plugin Java codebase to enhance observability and troubleshooting for attachment operations.

Logging Levels

DEBUG – Method entry/exit, cache lookups, flow decisions (e.g., "uploading as single chunk")
INFO – Key operations completed: uploads, folder creation, copy/move, service initialization
WARN – Recoverable issues: duplicates, unauthorized access, virus scan states, blocked MIME types
ERROR – Exceptions with stack traces, failed operations, HTTP errors

Log level Order: Debug,Info,Warn,Error and Fatal.

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist before requesting a review

• I follow Java Development Guidelines for SAP
• I have tested the functionality on my cloud environment.
• I have provided sufficient automated/ unit tests for the code.
• I have increased or maintained the test coverage.
• I have ran integration tests on my cloud environment.
• I have validated blackduck portal for any vulnerability after my commit.

Upload Screenshots/lists of the scenarios tested

• I have Uploaded Screenshots or added lists of the scenarios tested in description

Single tenant Integration test
https://github.com/cap-java/sdm/actions/runs/22334787232

multi tenant Integration test
https://github.com/cap-java/sdm/actions/runs/22334795569