Update token/clientKey on hmac change

[louisruch]

What does this PR do

The Boundary API does not return the ClientCertKey or the Token in the response, instead it returns an hmac for each of those fields. This PRs updates these fields to (changed in Boundary) when a change was detected on the corresponding hmac during a read request. This will allow tf to detect the ClientCertKey or the Token has changed.

Please note this will currently fail when changing a token back due to outstanding work on Boundary. However, it will at least notify the tf user that there was a change and they should update the tf file to match the current state.

This PR also updates:

• the change log to prepare the provider for release
• updates to the latest changes in the API/SDK

PR verification steps

Please note because of the outstanding work in Boundary to support changing back to a previously used token, the unit test cannot fully verify the final update back to the tf config. I did however verify the changes to detect token and certKey works by setting ExpectNonEmptyPlan: false and running the unit test:

Step 7/8 error: After applying this test step, the plan was not empty.
        stdout:
        
        
        An execution plan has been generated and is shown below.
        Resource actions are indicated with the following symbols:
          ~ update in-place
        
        Terraform will perform the following actions:
        
          # boundary_credential_store_vault.example will be updated in-place
          ~ resource "boundary_credential_store_vault" "example" {
              ~ address                     = "https://localhost:55209" -> "https://localhost:55208"
              ~ ca_cert                     = <<-EOT
                    -----BEGIN CERTIFICATE-----
                  - omitted by Louis to reduce size
                    -----END CERTIFICATE-----
                EOT
              ~ client_certificate          = <<-EOT
                    -----BEGIN CERTIFICATE-----
                  - omitted by Louis to reduce size
                    -----END CERTIFICATE-----
                EOT
              ~ client_certificate_key      = (sensitive value)
                id                          = "csvlt_sua590Vwix"
                name                        = "foo_random"
              ~ token                       = (sensitive value)
                # (7 unchanged attributes hidden)
            }

Without the changes from this PR the final step fails without the client_certificate_key and token detected as diffs:

Step 7/8 error: After applying this test step, the plan was not empty.
        stdout:
        
        
        An execution plan has been generated and is shown below.
        Resource actions are indicated with the following symbols:
          ~ update in-place
        
        Terraform will perform the following actions:
        
          # boundary_credential_store_vault.example will be updated in-place
          ~ resource "boundary_credential_store_vault" "example" {
              ~ address                     = "https://localhost:55213" -> "https://localhost:55212"
              ~ ca_cert                     = <<-EOT
                    -----BEGIN CERTIFICATE-----
                  - omited by Louis to reduce size
                    -----END CERTIFICATE-----
                EOT
              ~ client_certificate          = <<-EOT
                    -----BEGIN CERTIFICATE-----
                  - omitted by Louis to reduce size
                    -----END CERTIFICATE-----
                EOT
                id                          = "csvlt_eulp64wt7v"
                name                        = "foo_random"
                # (9 unchanged attributes hidden)
            }

[louisruch]

@talanknight @malnick PTAL

[malnick]

Thanks for including these, completely slipped on my PR for the library and store PR.