Removed support for deprecated `insert_sql` in associations.
Merge pull request #11253 from neerajdotname/removed-insert-sql

Removed support for deprecated `insert_sql` in associations.
resolve aliases before passing the hash to the predicate builder
no need to to_sym the column name, leave it as-is
Removed support for deprecated `delete_sql` in associations.
Merge pull request #11254 from neerajdotname/delete-sql-be-gone

Removed support for deprecated `delete_sql` in associations.
Dropped deprecated option `:restrict` for `:dependent` in associations
Merge pull request #11255 from neerajdotname/restrict-be-gone

Dropped deprecated option `:restrict` for `:dependent` in associations
deprecated `ActiveRecord::TestCase` is no longer public.

/cc @tenderlove
remove unused `ActiveRecord::TestCase#sqlite3` method.
Adding actionview in Rakefile to run test 

and create versions
remove wrong documentation from a :nodoc:'d method
Merge pull request #11257 from arunagw/adding_actionview

Adding actionview in Rakefile to run test [ci skip]
eagerly initialize the attributes module to avoid check-then-set race conditions
[doc] fixed printing of code samples
initialize ivars so we don't have to constantly check them
Remove deprecated SchemaStatements#distinct
we don't need to use active support *everwhere* common.
define attribute methods in a thread safe manner
remove private attribute reader