Add NATS support for Async Minion and secretName for remote artifact import

[versussun]

Description

• Add WithNatsConnection() extension to configure the Microcks Async Minion against a NATS broker (server, port, optional username/password), following the same pattern as the existing MQTT connection helper, and mark NATS as supported (✅) in the README features table.
• Add a secretName parameter to ImportRemoteArtifactAsync / IDownloadArtifactEndpoint.DownloadArtifactAsync so remote artifact imports can authenticate against a Microcks-registered secret, and pass it through from RemoteArtifact annotations in MicrocksApplicationEventingSubscriber.
• Document NATS usage (connection setup, required AsyncAPI nats binding, credentials, contract testing example) in the README.
• Add unit tests covering NATS-only configuration, NATS with credentials, and NATS combined with Kafka in ASYNC_PROTOCOLS.

Related issue(s)

Test results

dotnet test → 40 passed, 1 failed, 41 total.

Failed: Microcks.Aspire.Tests.Features.Async.Kafka.MicrocksKafkaTests.WhenBadMessageIsSent_ThenReturnsCorrectStatus
Pre-existing test, unrelated to this change (file not touched by this PR). Fails consistently locally
due to a fixed 500ms delay + events.Count >= 4 timing assumption that appears sensitive to local
container/environment speed; reproduced identically in isolation.

All new NATS-related unit tests pass:

• WhenOnlyNatsIsConfigured_ThenAsyncProtocolsContainsNats
• WhenNatsIsConfiguredWithCredentials_ThenUsernameAndPasswordAreSet
• WhenNatsAndKafkaAreConfigured_ThenAsyncProtocolsContainsAll

[github-actions]

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[Copilot]

Pull request overview

This PR extends the Microcks Aspire integration by adding NATS support for the Async Minion configuration and by enhancing remote artifact import to optionally authenticate using a Microcks-registered secret.

Changes:

• Added WithNatsConnection() to configure Async Minion environment variables for NATS and appended NATS to ASYNC_PROTOCOLS.
• Extended remote artifact import APIs to accept a secretName and wired it through from remote artifact annotations to the download endpoint call.
• Updated README documentation to describe NATS usage and marked NATS as supported in the features table; added unit tests for NATS protocol configuration.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/Microcks.Aspire.Tests/Features/Async/MicrocksAsyncProtocolsConfigurationTests.cs	Adds unit tests validating NATS environment variable/protocol list configuration.
src/Microcks.Aspire/MicrocksAsyncMinionExtensions.cs	Introduces WithNatsConnection() and ASYNC_PROTOCOLS updates for NATS.
src/Microcks.Aspire/MicrocksApplicationEventingSubscriber.cs	Passes SecretName through when importing remote artifacts.
src/Microcks.Aspire/Clients/MicrocksClient.cs	Threads secretName through to the download endpoint call.
src/Microcks.Aspire/Clients/IMicrocksClient.cs	Updates public client API to include secretName for remote artifact import.
src/Microcks.Aspire/Clients/IDownloadArtifactEndpoint.cs	Adds optional secretName query parameter to the download API call.
README.md	Documents NATS usage and updates supported protocols table.

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[versussun]

@SebastienDegodez @lbroudoux Guys please aproove PR. It blocks me. Because I need secret authorization. I`ve checked it in Azure DevOps and it is working fine. And also can you push it to NUGET. Please.