Added check spec validation

What's Changed

• Bump github.com/spf13/cobra from 1.3.0 to 1.4.0 by @dependabot in https://github.com/coinbase/rosetta-cli/pull/282
• ROSE-320: prototype of check:spec by @shiatcb in https://github.com/coinbase/rosetta-cli/pull/322
• Add check spec for network list by @irisZhangCB in https://github.com/coinbase/rosetta-cli/pull/324
• Rose 401: implement check:spec for data API and validation output format by @shiatcb in https://github.com/coinbase/rosetta-cli/pull/326
• ROSE-420: clean up check:spec logic to avoid duplicate validations by @shiatcb in https://github.com/coinbase/rosetta-cli/pull/332
• (nit) Update check_data long description to match docs by @racbc in https://github.com/coinbase/rosetta-cli/pull/330
• [chore]update version by @shrimalmadhur in https://github.com/coinbase/rosetta-cli/pull/334

Full Changelog: https://github.com/coinbase/rosetta-cli/compare/v0.7.8...v0.7.9