Add React Navigation support

[rakeshpetit]

This PR is an attempt to add React Navigation and a stack navigator to the scaffolded Expo app.

Todo

• [ ] Test yarn thoughtbelt navigation which I couldn't do.

Success flow

[rakeshpetit]

@stevehanson - I updated the tests and everything passes fine on the generated app but thoughtbelt still seems to complain on the CI. Hope to pair and resolve this.

[rakeshpetit]

@stevehanson - I updated the tests and everything passes fine on the generated app but thoughtbelt still seems to complain on the CI. Hope to pair and resolve this.

I think I've fixed that in the latest update.

[rakeshpetit]

Things work well on my local machine but fails on the CI 😞

[codeofdiego]

@rakeshpetit Can you try adding the file name "./**/*.tsx" to "include": ["./**/*.ts", "./**/*.tsx"], in tsconfig.json?

[rakeshpetit]

@rakeshpetit Can you try adding the file name "./**/*.tsx" to "include": ["./**/*.ts", "./**/*.tsx"], in tsconfig.json?

Adding __tests__ to tsconfig solved the problem in commit

[stevehanson]

Taking a look at this now to see what's left to get it to the finish line.