feat: Added iam commands

[Aerex]

Context

This PR will add a few new VSCode commands from the iam namespace in the IBM Cloud CLI. The following commands will be added:

• ibmcloud iam oauth-tokens
• ibmcloud iam service-id
• ibmcloud iam service-ids

Steps to Test

Run integration tests

1. Generate API key from IBM Cloud
2. Set and export the IBMCLOUD_API_KEY environment variable to the key generated in step 1
3. Login into IBM Cloud using CLI
4. Change directory to the root of your local ibm-developer-vscode repo
5. Run the command npm test
6. Verify that all tests pass

Test iam oauth-tokens command

1. Make sure to follow the steps in the Setup section in previous PRs
2. Open the Command Palette
   • To enter Command Palette press Ctrl+Shift+P or F1 or navigate to View-> Command Palette
3. Type and enter in ibmcloud login --sso in the Command Palette
4. Follow the instructions to login into IBM Cloud
5. Repeat step 2 (command palette)
6. Enter the command: ibmcloud iam oauth-tokens
7. Verify that IAM tokens are printed in the Output Channel

Test iam service-ids commands

1. Make sure to follow the steps 1-4 in Test iam oauth-tokens command section
2. Open the Command Palette
3. Type and enter the command: ibmcloud iam service-ids
4. Verify that the service-ids are printed in the Output Channel

Test iam service-id commands

1. Make sure to follow the steps 1-4 in Test iam oauth-tokens command section
2. Open the Command Palette
3. Type and enter the command: ibmcloud iam service-id
4. Verify that a dropdown is shown with a list of service-ids
5. Select or type in a service-id from the list
6. Verify that the service-id info is printed in the Output Channel

Videos

iam oauth-tokens

iam sevice-ids

iam sevice-id