[Ruby] Improve the method stubs and type names for dependency

[prabhu]

From my limited understanding, it appears like the pass is trying to guess the module names for a given gem based on the name casing. Below is a cli one liner that can be used instead to exactly know the module names offered by a given gem and its native extension. Replace sqlite3 with the gem name. Ignore any lines in the output that begins with Ignoring

ruby -e "initial = ObjectSpace.each_object(Module).map(&:name).compact;
require 'sqlite3';
afterwards = ObjectSpace.each_object(Module).map(&:name).compact;
added = afterwards - initial;
puts added.sort"

Delegator
SQLite3
SQLite3::AbortException
SQLite3::AuthorizationException
SQLite3::Backup
SQLite3::Blob
SQLite3::BusyException
SQLite3::CantOpenException
SQLite3::Constants
SQLite3::Constants::ColumnType
SQLite3::Constants::ErrorCode
SQLite3::Constants::Open
SQLite3::Constants::Optimize
SQLite3::Constants::Status
SQLite3::Constants::TextRep
SQLite3::ConstraintException
SQLite3::CorruptException
SQLite3::Database
SQLite3::Database::FunctionProxy
SQLite3::EmptyException
SQLite3::Exception
SQLite3::ForkSafety
SQLite3::ForkSafety::CoreExt
SQLite3::FormatException
SQLite3::FullException
SQLite3::HashResultSet
SQLite3::IOException
SQLite3::InternalException
SQLite3::InterruptException
SQLite3::LockedException
SQLite3::MemoryException
SQLite3::MismatchException
SQLite3::MisuseException
SQLite3::NotADatabaseException
SQLite3::NotFoundException
SQLite3::PermissionException
SQLite3::Pragmas
SQLite3::ProtocolException
SQLite3::RangeException
SQLite3::ReadOnlyException
SQLite3::ResultSet
SQLite3::SQLException
SQLite3::SchemaChangedException
SQLite3::Statement
SQLite3::TooBigException
SQLite3::UnsupportedException
SQLite3::Value
SimpleDelegator
WeakRef
WeakRef::RefError