Implement all API endpoints

[sakisk]

Companies House Public Data API

• [x] Search All
• [x] Search Companies
• [x] Search Disqualified Officers
• [x] Search Company Officers
• [x] Company profile
• [x] Registered office address
• [x] List the company officers
• [x] Get a company officer appointment
• [x] Get the filing history of the company
• [x] Get the filing history of the company per transaction
• [x] Get company insolvency information
• [x] Get a list of charges for a company
• [x] Get a single charge for a company
• [x] List the officer appointments
• [ ] Get a natural officer's disqualifications
• [ ] Get a corporate officer's disqualifications
• [ ] Get a list of UK Establishment companies
• [ ] Get the corporate entity with significant control
• [x] Get the individual person with significant control
• [ ] Get the legal person with significant control
• [ ] Get the person with significant control statement
• [ ] Get the super secure person with significant control
• [x] List the company persons with significant control
• [ ] List the company persons with significant control statements
• [ ] Get the company registers information
• [ ] Get the company exemptions information

Document API

• [x] Fetch a document
• [x] Fetch a document's metadata

[sakisk]

Feel free to add new endpoints or check as done the ones I've missed @kevbite