Filtered inactive stations when calling data Issue #8 (partial)

[97harsh]

1. Filtering inactive stations based on start date supplied
2. Added PSUN, TSUN in metrics (SNOW already present)

#########

IMPORTANT NOTICE

Before opening the Pull Request make sure that you:

• Have read the CONTRIBUTING GUIDE
• Have read the DATA MODEL and DATA SOURCES documentation.
• Have check that your code is compliant with both.
• Delete this notice, failing to do so will result in this PR being closed without prior review.

#########

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #8 (issue)(partially)

Checklist:

• [x] I have read the CONTRIBUTING GUIDE and made sure this Pull Request is compliant with it.
• [x] I have read the DATA MODEL and DATA SOURCES and made sure this Pull Request is compliant with it.
• [x] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules