refactor(google_search): migrate to new tool mode implementation

[Vigtu]

• Replace legacy tool mode using LCToolComponent with new Component class and tool_mode flag.

• Update input/output definitions to use new DataFrame type and explicit Output configuration.

Key changes:

• Migrate from LCToolComponent to Component base class
• Add explicit output configuration with DataFrame type
• Update error handling to return structured DataFrame responses
• Implement tool_mode using new flag syntax

[Vigtu]

@carlosrcoelho

[Vigtu]

Adhere to migration and depreciation guidelines. Also, utilize the new testing base classes along with the general tests boilerplate template.

I will work on this!