Implement colonychain

[chemonoworld]

Just for review

Select at least one type

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)
• Bug fix
• Dependency, Environment, Build related update
• Documentation
• Other tiny fix

Describe your changes

• change "astar" to "shiden"
• implement check_connection and get_last_block in ColonyChain
• add treasury_address and light_client_address to Struct

Issue ticket number and other helpful resource

Checklist before requesting a review

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• Leave reference about this pull request, if exist (ex. discord message,
  google docs, etc)
• If it is a core feature, I have added thorough tests.

Checklist after creating a pull request

• Mention reviews in discord channel directly