bounty/new: add new token model

[thelostone-mc]

Description

• refactors a good chunk of code to use Promises
• moved token auth check from shared to new_bounty.js
• added modal which asks funder to go to token page to enable token
• modal is triggered when funder changes token in dropdown to token which isn't enabled
• modal is also triggered if funder ignores that and attempts to fund an issue

Fixes

closes #4984

Testing

• Created bounty with ETH & succeeded
• Created bounty with an enabled ERC20 token & succeeded
• Attempted to create a bounty with an ERC token which wasn't enabled and wasn't able to

Recording HERE

[codecov]

Codecov Report

Merging #5002 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5002   +/-   ##
=======================================
  Coverage   30.92%   30.92%           
=======================================
  Files         217      217           
  Lines       17402    17402           
  Branches     2381     2381           
=======================================
  Hits         5382     5382           
  Misses      11801    11801           
  Partials      219      219

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 04f6d94...5beff5c. Read the comment docs.

[codecov]

Codecov Report

Merging #5002 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5002   +/-   ##
=======================================
  Coverage   30.92%   30.92%           
=======================================
  Files         217      217           
  Lines       17402    17402           
  Branches     2381     2381           
=======================================
  Hits         5382     5382           
  Misses      11801    11801           
  Partials      219      219

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 04f6d94...5beff5c. Read the comment docs.

[thelostone-mc]

This was removed as it's not needed !
And having this here cause the occasional bug where the modal would popup before the page was ready 🤷‍♂

[thelostone-mc]

moved the above into new_bounty.js and refactored to make it into 2 neat functions

[octavioamu]

LGTM