feat(anthropic): Implemented a web search tool, provided by Anthropic

[dev-jonghoonpark]

Implemented a web search tool, provided by Anthropic
This web search tool is categorized as a server tool.

related doc: https://docs.anthropic.com/en/docs/agents-and-tools/tool-use/web-search-tool

Changes

The serverTools property has been added to AnthropicChatOptions.

It can be used as follows:

AnthropicChatOptions.builder()
    .serverTools(List.of(WebSearchTool.builder().maxUses(1).build()))
    .build();

---

Note 1

I'm not sure if this is a temporary issue, but I was occasionally getting a 529 error (overloaded_error: Anthropic's API is temporarily overloaded.) during development.

related doc: https://docs.anthropic.com/en/api/errors

Note 2

The stream part was not developed in this PR.

[markpollack]

We will review, then we can discuss the streaming support.

[dev-jonghoonpark]

request = ModelOptionsUtils.merge(request, this.defaultOptions, ChatCompletionRequest.class);

I'm not sure why this code is needed or what it does.
I kept it to preserve the existing logic.

If I can understand why this is necessary, I think I can improve the code further.

[ilayaperumalg]

@dev-jonghoonpark Good point. This line makes sure to update the ChatCompletionRequest with any of the missing chat options which can be set via default chat options.

Though we use the default options to create the ChatCompletion Request:

ChatCompletionRequest request = new ChatCompletionRequest(this.defaultOptions.getModel(), userMessages,
				systemPrompt, this.defaultOptions.getMaxTokens(), this.defaultOptions.getTemperature(), stream);

not all the properties are updated in this and the model options utils helps merging any of the missing ones.

[dev-jonghoonpark]

@ilayaperumalg Thank you for the explanation.
However, why is it called only when !CollectionUtils.isEmpty(toolDefinitions) is true?

[dev-jonghoonpark]

Resolve conflicts with PR: #3365