Update spec test to v0.6.3 (#156)

* Add support for crosslink tests

* Add support for registry updates test

* Refresh support for deposit operation

* Add support for attestation test

* Add support for attester slashing test

* Add BlockHeader tests

* Add support for proposer slashing tests

* Add support for transfer tests

* Add support for blocks and slots sanity test

* Add scripts to run state tests

* Fix script

* Fix test path change