Support for application configuration service in 3.2 line

[TimHess]

Description

#1196 for 3.x -- notable difference here (for now) is this variant always replaces . with : in configuration keys found in the binding in order to align with how the config server client processes configuration

Also fixes some violations of CA2017

Quality checklist

• Your code complies with our Coding Style.
• You've updated unit and/or integration tests for your change, where applicable.
• You've updated documentation for your change, where applicable.
  If your change affects other repositories, such as Documentation, Samples and/or MainSite, add linked PRs here.
• There's an open issue for the PR that you are making. If you'd like to propose a new feature or change, please open an issue to discuss the change or find an existing issue.
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[TimHess]

/azp run Steeltoe.All

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Azure Pipelines successfully started running 1 pipeline(s).

[TimHess]

Companion sample PR SteeltoeOSS/Samples#318

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
80.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud