Implement FileURLParserBlock and FILE_URL WorkflowParameterType

[ykeremy]

:rocket:	This description was created by Ellipsis for commit 9bbb4def2774be9ba4fa9ed28694e8c500bb707e

Summary:

Introduced FileParserBlock and FILE_URL parameter type for file URL parsing in workflows, with necessary updates and enhancements across the codebase.

Key points:

• Introduced FileParserBlock and FILE_URL parameter type to handle file URL parsing in workflows.
• Added InvalidFileType exception in skyvern/forge/sdk/workflow/exceptions.py.
• Introduced FileParserBlock and FileType classes in skyvern/forge/sdk/workflow/models/block.py.
• Added FILE_URL to WorkflowParameterType in skyvern/forge/sdk/workflow/models/parameter.py.
• Created FileParserBlockYAML in skyvern/forge/sdk/workflow/models/yaml.py.
• Updated block_yaml_to_block function in skyvern/forge/sdk/workflow/service.py to handle FileParserBlock.
• Enhanced download_file and added download_from_s3 in skyvern/forge/sdk/api/files.py.
• Updated set_parameter_values_for_output_parameter_dependent_blocks in skyvern/forge/sdk/workflow/context_manager.py to handle list values.

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