plugins/cmd/chainlink-example-relay: add example relay

[jmank88]

Requires:

• pkg/sqlutil/pg: create package; expand env config chainlink-common#450

[github-actions]

I see you updated files related to core. Please run pnpm changeset in the root directory to add a changeset as well as in the text include at least one of the following tags:

• #added For any new functionality added.
• #breaking_change For any functionality that requires manual action for the node to boot.
• #bugfix For bug fixes.
• #changed For any change to the existing functionality.
• #db_update For any feature that introduces updates to database schema.
• #deprecation_notice For any upcoming deprecation functionality.
• #internal For changesets that need to be excluded from the final changelog.
• #nops For any feature that is NOP facing and needs to be in the official Release Notes for the release.
• #removed For any functionality/config that is removed.
• #updated For any functionality that is updated.
• #wip For any change that is not ready yet and external communication about it should be held off till it is feature complete.

🎖️ No JIRA issue number found in: PR title, commit message, or branch name. Please include the issue ID in one of these.

[cl-sonarqube-production]

Quality Gate passed

Issues
2 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[cl-sonarqube-production]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[github-actions]

Flakeguard Summary

Ran new or updated tests between develop and 37e3f95 (loopp-example).

View Flaky Detector Details | Compare Changes

Found Flaky Tests ❌

Name	Pass Ratio	Panicked?	Timed Out?	Race?	Runs	Successes	Failures	Skips	Package	Package Panicked?	Avg Duration	Code Owners
TestTransfersController_TransferBalanceToLowError	66.67%	false	false	false	3	2	1	0	github.com/smartcontractkit/chainlink/v2/core/web	false	1.223333333s	Unknown

Artifacts

For detailed logs of the failed tests, please refer to the artifact failed-test-results-with-logs.json.