Feature/Submission New API

[celestemartinez]

Test for submission invtation and paper submission for new API:

This PR requires:

API: https://github.com/openreview/openreview-api/pull/69 Web: https://github.com/openreview/openreview-web/pull/1018

[celestemartinez]

@melisabok should we add the retry_declined functionality to the recruitment in the venue class as well? We do not use this from the request form.

[codecov[bot]]

Codecov Report

Merging #1306 (c1d7176) into master (b5c7d55) will increase coverage by 0.21%. The diff coverage is 67.69%.

@@            Coverage Diff             @@
##           master    #1306      +/-   ##
==========================================
+ Coverage   73.32%   73.54%   +0.21%     
==========================================
  Files          26       32       +6     
  Lines        8566     9688    +1122     
  Branches     1562     1779     +217     
==========================================
+ Hits         6281     7125     +844     
- Misses       1877     2090     +213     
- Partials      408      473      +65     

Impacted Files	Coverage Δ
openreview/journal/journal.py	50.71% <0.00%> (-0.21%)	:arrow_down:
openreview/venue_request/venue_request.py	96.20% <ø> (ø)
openreview/venue/recruitment.py	51.76% <51.76%> (ø)
openreview/venue/matching.py	58.31% <58.31%> (ø)
openreview/venue/invitation.py	68.09% <68.09%> (ø)
openreview/api/client.py	61.52% <70.00%> (+8.48%)	:arrow_up:
openreview/venue/group.py	70.62% <70.62%> (ø)
openreview/conference/helpers.py	59.39% <75.60%> (+1.54%)	:arrow_up:
openreview/venue/venue.py	83.39% <83.39%> (ø)
openreview/__init__.py	100.00% <100.00%> (ø)
... and 6 more

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