[Feature] Add user auth, database support to candis, change UI for the same - add signup, signin forms etc.

[rupav]

Explanation About What Code Achieves:

• Explanation

• Used Formik and Yup for making SignUp and SignIn forms.

• User authentication using JWT tokens

• database chosen is postgreSQL

• envparse for parsing environment variables to set up the flask app config.

• For database migrations - using flask-migrate

Tables Created:

• Users - user details for auth, and relationship with other tables
• Pipeline - for pipeline data, many-to-one relation with User table
• CData - for storing cdata files/pandas dataframe, many-to-one relation with User table
• PipelineRun - for storing data related to every run of a pipeline... like .gist files - This needs to be improved. Have a many-to-one relation with Pipeline table.
• Response - for storing every endpoint's reponse - ID, status, data or error if any in JSON format

TODOs:

• API endpoints needs to be converted using Swagger convention of ReST APIs
• Improve PipelineRun Table.
• Add a table to hold gist data.
• to install and run postgres daemon through get-candis
• Run postgres daemon through get-candis.

[rupav]

Update
Connecting to database on travis build: env variables are passed using travis UI, refer settings of the travis.
Refer: https://docs.travis-ci.com/user/environment-variables/#Defining-Variables-in-Repository-Settings

because of https://docs.travis-ci.com/user/pull-requests/#Pull-Requests-and-Security-Restrictions, exposing env variables for travis build as non-sensitive testing data only.

[rupav]

Merging this ✨