fix: optimize the postInitializationHook in McpAsyncClient

[Fj-ivy]

Summary

I believe there might be two issues with the implementation of Function<Initialization, Mono> postInitializationHook in the constructor of the McpAsyncClient class.

1. invalid check condition about enableCallToolSchemaCaching condition
2. filter tool.outputSchema() using tool.outputSchema() != null

Optimization Details

The following optimizations have been made regarding the above two issues;

1. Remove the invalid check condition if (enableCallToolSchemaCaching && listToolsResult.tools() != null)
2. Using !Utils.isEmpty(tool.outputSchema()) instead of tool.outputSchema() !=null to filter.
3. Merge the log printing into the entire Lambda expression.

Comparison

Before

Function<Initialization, Mono<Void>> postInitializationHook = init -> {

			if (init.initializeResult().capabilities().tools() == null || !enableCallToolSchemaCaching) {
				return Mono.empty();
			}

			return this.listToolsInternal(init, McpSchema.FIRST_PAGE).doOnNext(listToolsResult -> {
				listToolsResult.tools()
					.forEach(tool -> logger.debug("Tool {} schema: {}", tool.name(), tool.outputSchema()));
				if (enableCallToolSchemaCaching && listToolsResult.tools() != null) {
					// Cache tools output schema
					listToolsResult.tools()
						.stream()
						.filter(tool -> tool.outputSchema() != null)
						.forEach(tool -> this.toolsOutputSchemaCache.put(tool.name(), tool.outputSchema()));
				}
			}).then();
		};

After:

Function<Initialization, Mono<Void>> postInitializationHook = init -> {

			if (init.initializeResult().capabilities().tools() == null || !enableCallToolSchemaCaching) {
				return Mono.empty();
			}

			return this.listToolsInternal(init, McpSchema.FIRST_PAGE)
                    .doOnNext(listToolsResult ->
                        listToolsResult.tools()
                                .stream()
                                .filter(tool -> !Utils.isEmpty(tool.outputSchema()))
                                .forEach(tool -> {
                                    logger.debug("Tool {} schema: {}", tool.name(), tool.outputSchema());
                                    // Put tool output schema to cache
                                    this.toolsOutputSchemaCache.put(tool.name(), tool.outputSchema());
                                })
			    ).then();
		};