fix(e2e-tests): add e2e-tests for `/accounts/{accoundId}/validate` (#731)

* add ValidateAddressService

* add ValidateAddressController

* add AccountsValidate to polkadot, westend, and kusama

* imports

* add kusama chain config

* fix response

* fix networkInfo bug

* lint

* get tests started

* change the name of the service

* cleanup, lint, fix build, test boilerplate

* update the tests

* more tests

* use hexToU8a for hex conversion

* add tests for hex values

* cleanup

* docs

* e2e tests for validate

* update e2e responses

* update docs

* Update docs/src/openapi-v1.yaml

Co-authored-by: David <[email protected]>

* docs

Co-authored-by: David <[email protected]>