1/n : fiat support - model changes

[thelostone-mc]

Description

• added modal changes needed to support fiat
• added help text for bounty fulfillments
• added custom migration to update existing data for newly added fields
• added TODO comments to alter fields name for later

Fields added:

Field	Description
payout_type	fiat / qr / standard_bounties
tenant	each payout_type has it's unique set on tenants Eg: celo for qr bounties / pypl for fiat
funder_address	same as bounty_owner_address but will be updated later on for shared mgmt
funder_profile	same as bounty_owner_profile but will be updated later on for shared mgmt
funder_identifier	unique funder identifier in fiat flow (like pypl username)
fulfiller_identifier	unique fulfiller identifier for when (like pypl username)

Testing

• std bounties flow (creation -> fulfillment -> payout)
• cross chain flow (creation -> fulfillment -> payout)
• ran custom migration to udpate exsisting db

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[danlipert]

looks good, just a few suggestions

[codecov]

Codecov Report

Merging #6668 into master will increase coverage by 0.03%.
The diff coverage is 61.29%.

@@            Coverage Diff             @@
##           master    #6668      +/-   ##
==========================================
+ Coverage   27.09%   27.12%   +0.03%     
==========================================
  Files         291      291              
  Lines       27039    27059      +20     
  Branches     3983     3985       +2     
==========================================
+ Hits         7325     7339      +14     
- Misses      19446    19452       +6     
  Partials      268      268              

Impacted Files	Coverage Δ
app/dashboard/helpers.py	14.19% <ø> (ø)
app/dashboard/views.py	10.99% <0.00%> (-0.06%)	⬇️
app/dashboard/models.py	50.50% <100.00%> (+0.14%)	⬆️
app/dashboard/embed.py	31.60% <0.00%> (+3.44%)	⬆️

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