`view --dem-blend`: support data/DEM in diff resolutions

[yunjunz]

Description of proposed changes

This PR supports input data and DEM files in different resolution for view --dem-blend (#1089), by resampling the lower resolution one into higher resolution on the fly using skimage.transform.resize()

• utils.plot.prep_blend_image(): add resampling on the fly using skimage.transform.resize() to support different resolutions between data and DEM while using the view.py --dem-blend option

• utils.plot.prep_blend_image(): change the default base_color from 0.9 to 0.7, for a slightly darker DEM background

• cli.view.cmd_line_parse(): ignore --cbar-ext option if --dem-blend is specified as well.

• .github/ISSUE_TEMPLATE/bug_report.md: add insar processor/product info

Reminders

• [x] Pass Pre-commit check (green)
• [x] Pass Codacy code review (green)
• [x] Pass Circle CI test (green)
• [x] Make sure that your code follows our style. Use the other functions/files as a basis.
• [x] If modifying functionality, describe changes to function behavior and arguments in a comment below the function declaration.