[Feature] API clients generation

[RabebOthmani]

As a user, I want to be able to generate an API client from within Graph Explorer So that I can work with the subset of Graph APIs I'm interested in

• Ability to fill in generation details (class name, namespace, language)
• Progress screen during generation
• Commands if user might want to use command-line

Work-items

• [x] #2406
• [x] #2404
• [x] #2405
• [x] #2407
• [x] #2408
• [x] #2409
• [x] #2410
• [x] #2687
• [ ] #2733
• [x] #2866
• [x] #2903

[RabebOthmani]

Team, Dani provided design for this feature. @adhiambovivian I'll leave it to you and the team to break this down to finer tasks