Fix #883 - Cell Operation Names not PascalCased

[dthyresson]

Fixes #883

As of v0.14.0, cell queries now get an operation name to work with Storybook:

See: #867

Example:

export const QUERY = gql`
- query {
+ query TestQuery {
    userProfile {
     id
   }
  }
`

I created a cell via the generator:

yarn rw g cell my_sites

and

✔ Generating cell files...
    ✔ Writing 
`./web/src/components/MySitesCell/MySitesCell.mock.j
s`...
    ✔ Writing 
`./web/src/components/MySitesCell/MySitesCell.storie
s.js`...
    ✔ Writing 
`./web/src/components/MySitesCell/MySitesCell.test.j
s`...
    ✔ Writing `./web/src/components/MySitesCell/MySi
tesCell.js`...
✨  Done in 1.57s.

the files, used the MySite upper camelCasing (aka Pascal Case).

However, my query operation name is

export const QUERY = gql`
  query my_sitesQuery {
    mySites {
      id
    }
  }
`

This PR:

• pascal cases the operation name
• adds test for snakeCase file name input: user_profile
• adds test for kebabCase file name input: user-profile
• adds test for camelCase file name input: userProfile

that all expect the UserProfileQuery operation name.

[peterp]

Thanks for this <3