feat(eg): add new fields of EG data source and resource

[Zippo-Wang]

What this PR does / why we need it:
feat(eg): add new fields of EG data source and resource

Which issue this PR fixes:
(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)
fixes #xxx

Special notes for your reviewer:

Release note:

PR Checklist

# data.eg_custom_event_sources
=== RUN   TestAccDataCustomEventSources_filterByFuzzyName
=== PAUSE TestAccDataCustomEventSources_filterByFuzzyName
=== CONT  TestAccDataCustomEventSources_filterByFuzzyName
--- PASS: TestAccDataCustomEventSources_filterByFuzzyName (12.67s)
PASS


=== RUN   TestAccDataCustomEventSources_filterBySort
=== PAUSE TestAccDataCustomEventSources_filterBySort
=== CONT  TestAccDataCustomEventSources_filterBySort
--- PASS: TestAccDataCustomEventSources_filterBySort (12.09s)
PASS


# data.eg_connections
=== RUN   TestAccDataConnections_basic
=== PAUSE TestAccDataConnections_basic
=== CONT  TestAccDataConnections_basic
--- PASS: TestAccDataConnections_basic (11.56s)
PASS

# data.custom_event_channels
=== RUN   TestAccDataCustomEventChannels_fuzzyName
=== PAUSE TestAccDataCustomEventChannels_fuzzyName
=== CONT  TestAccDataCustomEventChannels_fuzzyName
--- PASS: TestAccDataCustomEventChannels_fuzzyName (19.92s)
PASS

=== RUN   TestAccDataCustomEventChannels_sort
=== PAUSE TestAccDataCustomEventChannels_sort
=== CONT  TestAccDataCustomEventChannels_sort
--- PASS: TestAccDataCustomEventChannels_sort (14.72s)
PASS

# resource.eg_connection
=== RUN   TestAccConnection_basic
=== PAUSE TestAccConnection_basic
=== CONT  TestAccConnection_basic
--- PASS: TestAccConnection_basic (68.20s)