fix: DIA-1144: Mensuration demo fixed

[matt-bernstein]

• add LSE support
• workarounds for adding extra task columns while preserving the ability to upload images one at a time instead of building a tasks.csv or tasks.json
• add smaller-scale image example
• add calculated length and width of polygon

[smohan123]

Marcus and I reviewed the video of the feature and we approve it on the basis of meeting the client's requirements. Thank you!