feat: add claude backend

[tssurya]

This is my first pull request to this repo, I need to add some docs and tests, would need some pointers on where exactly to change them.

📑 Description

This PR adds support for using claude backend with k8sgpt.

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

Additional Information

[AlexsJones]

This needs an entry into pkg/ai/iai.go

e.g.,

	clients = []IAI{
		&OpenAIClient{},
		&AzureAIClient{},
		&LocalAIClient{},
		&OllamaClient{},
		&NoOpAIClient{},
		&CohereClient{},
		&AmazonBedRockClient{},
		&SageMakerAIClient{},
		&GoogleGenAIClient{},
		&HuggingfaceClient{},
		&GoogleVertexAIClient{},
		&OCIGenAIClient{},
		&IBMWatsonxAIClient{},
	}
	Backends = []string{
		openAIClientName,
		localAIClientName,
		ollamaClientName,
		azureAIClientName,
		cohereAIClientName,
		amazonbedrockAIClientName,
		amazonsagemakerAIClientName,
		googleAIClientName,
		noopAIClientName,
		huggingfaceAIClientName,
		googleVertexAIClientName,
		ociClientName,
		ibmWatsonxAIClientName,
	}

Also - is this a passwordless provider?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 31 lines in your changes missing coverage. Please review.

Project coverage is 34.59%. Comparing base (173e4dc) to head (fcc1802).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/ai/anthropic.go	0.00%	31 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1297      +/-   ##
==========================================
- Coverage   34.76%   34.59%   -0.17%     
==========================================
  Files          94       95       +1     
  Lines        6342     6373      +31     
==========================================
  Hits         2205     2205              
- Misses       4046     4077      +31     
  Partials       91       91              

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