Output lookml results as json

[nickdeis]

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Change description

Adds the flag --json, that allows you to output lookml results as raw json

Type of change

• [ ] Bug fix (fixes an issue)
• [x] New feature (adds functionality)

Security

• [x] Security impact of change has been considered
• [x] Code follows security best practices and guidelines

Code review

• [x] Pull request has a descriptive title and context useful to a reviewer

[joshtemple]

Hey @nickdeis, thanks for this! Could you expand this so the --json option works for all subcommands? (e.g. spectacles sql, spectacles content, etc.)