Add "Proposal template" field to RFPs

[ilikesymmetry]

What's included in this pr + description

• Add "Proposal template" field to RFP form
• Add bodyPrefill argument to createRfp and updateRfpContent mutations
• Populate initialValues.body for proposal form for templates from bodyPrefill
• Add editing of bodyPrefill in RFP settings
• refactor use of markdown textareas to standardize implementation and share components
• clicking the markdown of an input will change it to input mode and autofocus cursor!

Motivation & Context

• many users have requested the ability to ask for specific information from proposers when using RFPs
• this further assists alongside submission guidelines to help proposers create high-quality proposals

Steps to test

1. create an rfp
2. fill in proposal template, can toggle between "read" and "edit"
3. submit and propose to rfp -> see prefilled body
4. edit rfp -> see saved value
5. editing proposal template saves properly

Screenshots and/or loom video

Outstanding issues

• no validation on section header existence or content underneath on proposal templates

[linear[bot]]

WEB-1022 Add "proposal template" field to rfps

[vercel[bot]]

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Name	Status	Preview	Updated
web	✅ Ready (Inspect)	Visit Preview	Nov 7, 2022 at 7:37PM (UTC)