Enhance Oracle Database MCP Toolkit: Toolsets, Admin/DB Tools and Runtime Config

[Youssef-Erradi]

Description

This PR aims to improve the Oracle Database MCP toolkit by introducing to following changes:

• Change DEMO.md to focus on how to build a simple MCP server and connect to it rather than using a deployed instance.
• Update Maven version in Dockerfile.
• Add admin tools: create-tool, edit-tool and list-tool.
• Add database tools: read-query, write-query, create-table, delete-table, list-tables, describe-table, start-transaction, resume-transaction, commit-transaction, rollback-transaction, db-ping and db-metrics-range.
• Add Toolsets support, which allows the user to enable multiple tools using the toolsets name, the built-in toolsets are: mcp-admin, log-analyzer, database-operator, rag.
• Support runtime update of custom tools through changing YAML config file.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules