feat(integrations): API

[king-11]

Fixes #9

• update channel type enum
• add integration structs
• add integration methods

[jainpawan21]

@kymppi could you please help us in reviewing this PR?

[king-11]

made a slight mistake in hindsight, didn't rename the step_filter_type to type sending a PR for the same

[king-11]

@kymppi can you please check #40