Make using_time_based_indices automatic at the class level

[esmarkowski]

Time based indices are typically on a per model basis. If we detect a query that uses key specified in use_time_based_indices then we should automatically add the indexes to search_options.

.without_time_based_indices! should turn off this behavior on a per query basis.

• Add use_time_based_indices class method
• Allow the index pattern to be specified and set index_name
• using: a Proc or method to determine the required indices
• context: specify context to trigger time_based_indices
• default: default index name (can be most recent index or index_name*, etc)
• QueryBuilder should detect queries that require time-based indices and populate search_options

class Post < Stretchy::Record
   use_time_based_indices :created_at, 
      pattern: "posts_%Y_%m",
      default: "posts_*",
      context: [:query, :filter],
      using: :time_based_indices
end