fix!: The term "scheme" is used properly as defined by RFC9110

[dadrus]

Related issue(s)

closes #1044

Checklist

• I agree to follow this project's Code of Conduct.
• I have read, and I am following this repository's Contributing Guidelines.
• I have read the Security Policy.
• I have referenced an issue describing the bug/feature request.
• I have added tests that prove the correctness of my implementation.
• I have updated the documentation.

Description

As described in the issue referenced above, a property allowing to configure the Authorization header scheme is named schema (a at the end). This is unexpected and given the currently raised JSON schema validation error on start of heimdall not obvious. Because of that this PR changes the name of the property to what everybody expects it to be, namely scheme.

NOTE: Affected are all authenticator mechanisms, which define a property of Authentication Data Source type, namely (jwt, oauth2_interospection and generic).

The below jwt authenticator examples show the differences between the configuration before this PR and configuration changes introduced by this PR.

old configuration

id: jwt_authenticator
type: jwt
config:
  jwks_endpoint:
    url: http://foo/token
    jwt_source:
     - header: Authorization
       schema: Bearer  # property ends with 'a'

new configuration

id: jwt_authenticator
type: jwt
config:
  jwks_endpoint:
    url: http://foo/token
    jwt_source:
     - header: Authorization
       scheme: Bearer  # property ends with 'e' as it is actually expected

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (312ace1) 89.42% compared to head (7c37dcf) 89.42%.
Report is 2 commits behind head on main.

❗ Current head 7c37dcf differs from pull request most recent head 516e7c9. Consider uploading reports for the commit 516e7c9 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1042   +/-   ##
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  Coverage   89.42%   89.42%           
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  Files         248      248           
  Lines       10179    10179           
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  Hits         9103     9103           
  Misses        842      842           
  Partials      234      234           

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