feat: add required env var validation for Bright Data API key in tools

[mplachta]

Most importantly, added the below code to all BaseTool classes:

env_vars: List[EnvVar] = [
        EnvVar(
            name="BRIGHT_DATA_API_KEY",
            description="API key for Bright Data",
            required=True,
        ),
    ]

Other than that, just a bit of cleanup.

---

Note

Adds required EnvVar metadata for BRIGHT_DATA_API_KEY across Bright Data Dataset, SERP, and Web Unlocker tools.

• Bright Data tools:
  • Add env_vars with required BRIGHT_DATA_API_KEY to crewai_tools/tools/brightdata_tool/brightdata_dataset.py, brightdata_serp.py, and brightdata_unlocker.py.
  • Update imports to include EnvVar and List where needed.

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