feat(keychain-vault): add the missing endpoint classes #676

1. Adds the has/delete endpoints (which were missing completely)
2. Adds the get/set endpoints which were partially already implemented.
3. Moves the express dependency to be a dev dependency since we only
use the types (e.g. only needed at compile time, not at runtime)
4. Adds specific test cases to the API client verifying the
get/set/has/delete endpoints
5. Renames the getKeychainEntry and setKeychainEntry operationIDs
to have a V1 suffix.

Fixes #676

Signed-off-by: Peter Somogyvari <peter.somogyvari@accenture.com>

packages/cactus-cmd-api-server/src/test/typescript/integration/remote-plugin-imports.test.ts

@@ -88,10 +88,10 @@ test("NodeJS API server + Rust plugin work together", async (t: Test) => {
   const key = uuidv4();
   const expected = uuidv4();
 
-  await apiClient.setKeychainEntry({ key, value: expected });
+  await apiClient.setKeychainEntryV1({ key, value: expected });
   const {
     data: { value: actual },
-  } = await apiClient.getKeychainEntry({ key });
+  } = await apiClient.getKeychainEntryV1({ key });
 
   t.equal(actual, expected, "Keychain stored value matches input OK");