support for context and quiet mode in platform calls

[pnickolov]

Description

Internal changes in fsoc that allow callers of the platform package to modify the platform API calls they make:

• specify a go Context (e.g., to control timeouts and cancellations)
• suppress the progress message and spinner shown during calls

In addition, the spinner is now not even created when stderr is not a terminal. (This should not be a user-visible change, since the spinner package already doesn't show the message if the output is not a terminal.)

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass