add ssh grant; basic functionality

cmd/mytoken-server/main.go

config/example-config.yaml

go.mod

go.sum

internal/config/config.go

internal/db/dbmigrate/scripts/v0.2.0.pre.sql

internal/db/dbmigrate/scripts/v0.4.0.pre.sql

internal/db/dbrepo/grantrepo/grants.go

internal/db/dbrepo/mytokenrepo/mytoken.go

internal/db/dbrepo/mytokenrepo/mytokenrepohelper/helpers.go

...b/dbrepo/mytokenrepo/transfercoderepo/pollingCodeTmpMT.go

...al/db/dbrepo/mytokenrepo/transfercoderepo/transfercode.go

internal/db/dbrepo/sshrepo/sshrepo.go

internal/db/dbrepo/versionrepo/versionrepo.go

internal/endpoints/configuration/configurationEndpoint.go

internal/endpoints/consent/pkg/capability.go

internal/endpoints/consent/pkg/consentrequest.go

internal/endpoints/settings/grants/grants.go

...al/endpoints/settings/grants/pkg/grantTypeInfoResponse.go

internal/endpoints/settings/grants/pkg/grantTypeRequest.go