feat: Add AppConfig parameter provider

[amirkaws]

Issue number: #558

Summary

This PR enhanced the parameters utility functionality and adds support for AppConfig and FeatureFlags

Changes

Parameters utility has been modified to add support for AppConfig

User experience

// Get AppConfig Provider instance
IAppConfigProvider appConfigProvider = ParametersManager.AppConfigProvider
    .DefaultApplication("MyApplicationId")
    .DefaultEnvironment("MyEnvironmentId")
    .DefaultConfigProfile("MyConfigProfileId");

// Retrieve a single configuration, latest version
IDictionary<string, string?> value = await appConfigProvider
    .GetAsync()
    .ConfigureAwait(false);

// Check if feature flag is enabled
var isFeatureFlagEnabled = await appConfigProvider
    .IsFeatureFlagEnabledAsync("MyFeatureFlag")
    .ConfigureAwait(false);

if (isFeatureFlagEnabled)
{
    // Retrieve an attribute value of the feature flag
    var strAttValue = await appConfigProvider
        .GetFeatureFlagAttributeValueAsync<string>("MyFeatureFlag", "StringAttribute")
        .ConfigureAwait(false);

    // Retrieve another attribute value of the feature flag
    var numberAttValue = await appConfigProvider
        .GetFeatureFlagAttributeValueAsync<int>("MyFeatureFlag", "NumberAttribute")
        .ConfigureAwait(false);
}

Checklist

Please leave checklist items unchecked if they do not apply to your change.

• [x] Meets tenets criteria
• [x] I have performed a self-review of this change
• [x] Changes have been tested
• [x] Changes are documented
• [x] PR title follows conventional commit semantics

Is this a breaking change?

**RFC issue number**: Checklist: * [ ] Migration process documented * [ ] Implement warnings (if it can live side by side)

Acknowledgment

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[sonarcloud[bot]]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
2.6% Duplication on New Code

See analysis details on SonarCloud

[hjgraca]

cc @aviv-akhansari. AppConfig provider work

[aviv-akhansari]

This is awesome. Thank you.