Support uploaded config, add 'publish-webapp-deployer' and 'request-webapp-deployment' commands (#938)

This adds two new commands: `publish-webapp-deployer` and `request-webapp-deployment`.

`publish-webapp-deployer` creates a `WebappDeployer` record, which provides information to requestors like the API URL, minimum required payment, payment address, and public key to use for encrypting config.

```
$ laconic-so publish-deployer-to-registry \
  --laconic-config ~/.laconic/laconic.yml \
  --api-url https://webapp-deployer-api.dev.vaasl.io \
  --public-key-file webapp-deployer-api.dev.vaasl.io.pgp.pub  \
  --lrn lrn://laconic/deployers/webapp-deployer-api.dev.vaasl.io  \
  --min-required-payment 100000
```

`request-webapp-deployment` simplifies publishing a `WebappDeploymentRequest` and can also handle automatic payment, and encryption and upload of configuration.

```
$ laconic-so request-webapp-deployment \
  --laconic-config ~/.laconic/laconic.yml \
  --deployer lrn://laconic/deployers/webapp-deployer-api.dev.vaasl.io \
  --app lrn://cerc-io/applications/webapp-hello-world@0.1.3 \
  --env-file ~/yaml/hello.env \
  --make-payment auto
```

Related changes are included for the deploy/undeploy commands for decrypting and using config, using the payment address from the WebappDeployer record, etc.

Reviewed-on: #938

stack_orchestrator/deploy/k8s/cluster_info.py

@@ -14,6 +14,7 @@
 # along with this program.  If not, see <http:#www.gnu.org/licenses/>.
 
 import os
+import base64
 
 from kubernetes import client
 from typing import Any, List, Set
@@ -260,12 +261,12 @@ class ClusterInfo:
             for f in os.listdir(cfg_map_path):
                 full_path = os.path.join(cfg_map_path, f)
                 if os.path.isfile(full_path):
-                    data[f] = open(full_path, 'rt').read()
+                    data[f] = base64.b64encode(open(full_path, 'rb').read()).decode('ASCII')
 
             spec = client.V1ConfigMap(
                 metadata=client.V1ObjectMeta(name=f"{self.app_name}-{cfg_map_name}",
                                              labels={"configmap-label": cfg_map_name}),
-                data=data
+                binary_data=data
             )
             result.append(spec)
         return result