Add integration with Commcare

[gonzalesedwin1123]

• [x] Added UI components
• [x] Field mapping (commcare - OpenSPP fields) configuration
• [ ] Support One2many, Many2many, and Many2one fields in mapping
• [ ] Provide a way to get the field mapping reference from commcare
• [x] Add extendable function for mapping field values
• [ ] Fix all TODOs in code

[adriancris]

Not yet tested