Add capability to specify proxy for Artifactory repository replications

[Guent4]

Is your feature request related to a problem? Please describe.
I have a use case where I am trying to configure Artifactory replications through Terraform and need to be able to set a proxy for the replication.

Describe the solution you'd like
I have already gotten the change merged in for jfrog-client-go jfrog/jfrog-client-go#524 and the change was rolled out in v1.10.0. The changes needed for this repo would be:

1. Update go.mod to import v1.10.0 of the jfrog-client-go library
2. Update resource_artifactory_push_replication.go, resource_artifactory_replication_config.go, resource_artifactory_single_replication_config.go, and their corresponding docs to account for the proxy field

Describe alternatives you've considered
None

Additional context
The field that I want to set is the one in the red box here:

[Guent4]

See PR: #337