feat: implemented feature to edit BGP IPs and ASN values for non provider and provider flow gateways.

[purandarrao]

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Output from acceptance testing:

$ make testacc TEST=./ibm TESTARGS='-run=TestAccIBMDLProviderGateway_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./ibm -v -run=TestAccIBMDLProviderGateway_basic -timeout 700m
…
…
=== RUN   TestAccIBMDLProviderGateway_basic
--- PASS: TestAccIBMDLProviderGateway_basic (65.29s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm 66.744s

$ make testacc TEST=./ibm TESTARGS='-run=TestAccIBMDLGateway_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./ibm -v -run=TestAccIBMDLGateway_basic -timeout 700m
…
…
=== RUN   TestAccIBMDLGateway_basic
--- PASS: TestAccIBMDLGateway_basic (139.51s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm 141.232s

[hkantare]

Please resolve the conflicts in go.mod and update the documentation with new attributes and removing force new on the attributes which supports update

[purandarrao]

Please resolve the conflicts in go.mod and update the documentation with new attributes and removing force new on the attributes which supports update

@hkantare Thanks. Resolved conflicts and I've removed force new property. We don't need any documentation change, since all the 3 fields are that are supported for update are already existing fields.

[hkantare]

And in docs need to remove the property (Force new resource) since now update is supported

For all the changes