feat: adds agent activate and deactivate commands (W-19127491)

[shetzel]

What does this PR do?

Adds agent activate and agent deactivate commands.

NOTE: Requires forcedotcom/agents#133. For testing, link the branch from that PR and build.
NOTE: The tsconfig.json edits will be removed before merging.

What issues does this PR fix or reference?

@W-19127491@

[WillieRuemmele]

QA Notes

for both library + plugin

✅ : correct error message when activating Copilot_for_Salesforce
✅ : correct error message when deactivating Copilot_for_Salesforce
✅ : no error when activating already active agent
✅ : no error when deactivating agent
✅ : no error when deactivating already inactive agent
✅ : able to activate inactive agent
🆗 : no --json output
🔬 : 2 extra lines printed on invalid api name error

➜  afdx-pro-code-testdrive git:(main) ✗  hub:(GLOBAL - DevHub) scratch:(testdrive)
 ➜  ../../oss/plugin-agent/bin/run.js agent deactivate -n My_Agent1
Error (MissingAgentInOrgError): Agent My_Agent1 not found in org willieruemmele594@agentforce.com.


➜  afdx-pro-code-testdrive git:(main) ✗  hub:(GLOBAL - DevHub) scratch:(testdrive)

✅ : nice error for invalid api name for activate/deactivate
✅ : json response in error conditions with --json