feat(mcp): refactor MCP transport configuration to use dedicated starters

[tzolov]

• Add dedicated spring-ai-starter-mcp-webmvc and spring-ai-starter-mcp-webflux starters
• Remove transport property-based configuration in favor of auto-configuration
• Update WebMvc/WebFlux configuration to use ConditionalOnMissingBean

[markpollack]

shoud be spring-ai-mcp-client-webflux-spring-boot-starter

[markpollack]

I had some doc changes that somehow got written into the root project directory, i didn't remerge them in but pulled the branch from scratch and rebased and squashed. I'll get back to merging my doc changes tomorrow.

It's a big PR and moves us in the right direction. There are some improvements to discuss, but I felt it is easier to work on it after it is in main vs. more iterations around this PR and the corresponding PR in the examples repo.

	public List<McpAsyncClient> mcpAsyncClients(McpAsyncClientConfigurer mcpSyncClientConfigurer,
			McpClientCommonProperties commonProperties,
			ObjectProvider<List<NamedClientMcpTransport>> transportsProvider) {

If there are other ClientMcpTransports created by the user in their own @bean definition, then they aren't going to get picked up in to List<NamedClientMcpTransport>

Also, if the use creates their own McpSyncClient and has the starter in their pom, it will be correctly wired in.

merged in fe377ee