Allow custom timeout with dhall coder

This is needed on ruby3

RecordSelector has a record method as well

Allow lazy_object 0.1.0

Fix for ruby 3 seperation of hash and keyword args

Fix map decode when transform_keys is not to_s

Require SimpleDelegator properly

Fixed multihashes has been released

Fix for Ruby 2.6+

Ruby 2.6 added a new method named `then` to `Object` which broke us using the
method_missing based DSL.  Switch to def_attr for then/else to fix this.

Update to dhall-lang v10.0.0

Switch encoding of binary URI format

Support mixed-kind records

Fix for new Set#=== in newer Ruby

Because breaking things is point releases is how Ruby rolls.

Update dhall-lang

Pass newly added tests

x // x => x

Minitest fail fast for unit tests

Update dhall-lang

Simplify Natural/subtract on x === y

Implement dependent types, assert : A === B