Use -i for stdin in snow sql

[sfc-gh-turbaszek]

Pre-review checklist

• I've confirmed that instructions included in README.md are still correct after my changes in the codebase.
• I've added or updated automated unit tests to verify correctness of my new code.
• I've added or updated integration tests to verify correctness of my new code.
• I've confirmed that my changes are working by executing CLI's commands manually.
• I've confirmed that my changes are up-to-date with the target branch.
• I've described my changes in the release notes.
• I've described my changes in the section below.

Changes description

-i has to be provided to use stdin as query input

[sfc-gh-cgorrie]

@sfc-gh-turbaszek Many CLI tools treat stdin as the default when no input option is given, as is the current behaviour of the tool. What was the motivation for changing this behaviour?

[sfc-gh-turbaszek]

@sfc-gh-turbaszek Many CLI tools treat stdin as the default when no input option is given, as is the current behaviour of the tool. What was the motivation for changing this behaviour?

1. Being more explicit about the behaviour. 2. Leaving space for snow sql starting a SQL session (like snowsql).