Add resource_templates to MCP::Client

[sjrct]

This adds support for querying resource templates to the MCP::Client

I also removed an unused require from logging_message_notification.rb

Motivation and Context

Prior there was no MCP::Client interface for listing resource templates

How Has This Been Tested?

I tested it with the following script with an mcp server I have:

require_relative 'lib/mcp'

transport = MCP::Client::HTTP.new(url: "http://localhost:8080/mcp")
client = MCP::Client.new(transport: transport)

templates = client.resource_templates

templates.each do |template|
  puts JSON.pretty_generate(template)
end

And added tests to test/mcp/client_test.rb

Breaking Changes

No breaking changes, just the new method

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[koic]

Looks good to me. Can you squash your commits into one?

I also removed an unused require from logging_message_notification.rb

Good catch. This removal is outside the scope of the changes intended in this PR, so it would be better to split it into a separate PR if possible.