Quick Form: Pasture Condition Score Sheet

This should wait for #3336224: Add a convention base field to assets and logs → so that the quick form can populate this field on logs it creates.

I have a first pass of this in a 2.x-pcs branch of my fork here: https://github.com/mstenta/farm_nrcs/tree/2.x-pcs

It has two commits, both still marked as "work in progress". One adds a very simple quick form, and the other adds a NRCS:pasture-condition-score:1.0 convention document.

This still needs some review, and there are some potential next steps like including more of the guidance information from (or at least a link to) the PDF: https://www.nrcs.usda.gov/sites/default/files/2022-09/Pasture%20Conditio...