[MBL-1164] Add post campaign fields to project queries/mutations

[mtgriego]

📲 What

Add two fields to the project model in graphql and in app:
-isPostCampaignEnabled
-postCampaignPledgingEnabled

🤔 Why

These fields will be used to determine if the campaign will be allowed to go into the post campaign flow (only if both are true)

🛠 How

Added the fields to the fragments for graph, added them to the model for app model

📋 QA

Check the logs on staging for these fields:
(Look up the project Baconbaconbacon on staging for a true result)
"isInPostCampaignPledgingPhase":true,"postCampaignPledgingEnabled":true,
(Most projects will be false as its not enabled creator side yet)
"isInPostCampaignPledgingPhase":false,"postCampaignPledgingEnabled":false,

Story 📖

MBL-1164

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 73.85%. Comparing base (2e0818f) to head (5244001).

Files	Patch %	Lines
...pp/src/main/java/com/kickstarter/models/Project.kt	85.71%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1965      +/-   ##
============================================
- Coverage     73.85%   73.85%   -0.01%     
+ Complexity     1979     1978       -1     
============================================
  Files           348      348              
  Lines         19892    19903      +11     
  Branches       2755     2755              
============================================
+ Hits          14692    14699       +7     
- Misses         3586     3589       +3     
- Partials       1614     1615       +1     

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