[#IC-131] Add impersonate service endpoint to retrieve user data by service id

[fabriziopapi]

Add a new endpoint to retrieve the user data from APIM required to impersonate another service.
With this endpoint, an authorized service could get the info generally populated by the APIM starting from a subscription key without knowing the key itself. This allow a service to impersonate another one.

List of Changes

Add the impersonate-service endpoint

Motivation and Context

In the MVL project, we require a service (the PEC-SERVER) to impersonate another service in order to proper forware a legal mai via IO message.

How Has This Been Tested?

unit test
local system test (pending)

Screenshots (if appropriate):

Types of changes

• Chore (nothing changes by a user perspective)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[pagopa-github-bot]

	Warnings
⚠️	Please include a Pivotal story at the beginning of the PR title (see below).

Example of PR titles that include pivotal stories:

• single story: [#123456] my PR title
• multiple stories: [#123456,#123457,#123458] my PR title

Generated by 🚫 dangerJS

[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
4.6% Duplication