Require common libs at top-leve (#754)

lib/langchain.rb

@@ -4,6 +4,9 @@
 require "pathname"
 require "rainbow"
 require "zeitwerk"
+require "uri"
+require "json"
+
 loader = Zeitwerk::Loader.for_gem
 loader.ignore("#{__dir__}/langchainrb.rb")
 loader.inflector.inflect(
@@ -30,6 +33,7 @@
 
 loader.collapse("#{__dir__}/langchain/tool/calculator")
 loader.collapse("#{__dir__}/langchain/tool/database")
+loader.collapse("#{__dir__}/langchain/tool/docs_tool")
 loader.collapse("#{__dir__}/langchain/tool/file_system")
 loader.collapse("#{__dir__}/langchain/tool/google_search")
 loader.collapse("#{__dir__}/langchain/tool/ruby_code_interpreter")

lib/langchain/output_parsers/structured_output_parser.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require "json"
 require "json-schema"
 
 module Langchain::OutputParsers

lib/langchain/processors/eml.rb

@@ -1,4 +1,4 @@
-require "uri"
+# frozen_string_literal: true
 
 module Langchain
   module Processors

lib/langchain/prompt/base.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require "strscan"
-require "json"
 require "yaml"
 
 module Langchain::Prompt

lib/langchain/prompt/loading.rb

@@ -2,7 +2,6 @@
 
 require "strscan"
 require "pathname"
-require "json"
 require "yaml"
 
 module Langchain::Prompt

lib/langchain/tool_definition.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "json"
-
 #
 # Extends a class to be used as a tool in the assistant.
 # A tool is a collection of functions (methods) used to perform specific tasks.

lib/langchain/vectorsearch/epsilla.rb

@@ -1,9 +1,7 @@
 # frozen_string_literal: true
 
 require "securerandom"
-require "json"
 require "timeout"
-require "uri"
 
 module Langchain::Vectorsearch
   class Epsilla < Base

spec/spec_helper.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require "pathname"
-require "json"
 require "yaml"
 require "langchain"
 require "pry-byebug"