Refactor DC Outer Loops creation

[vmouradian]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem?

Part of #1091 + adds consistency (imo)

What kind of change does this PR introduce?

Feature

• DC Outerloops creation is made more consistent with AC ones (created in the OLF parameters class then are contained in DcLoadFlowParameters)

What is the current behavior?

What is the new behavior (if this is a feature change)?

Does this PR introduce a breaking change or deprecate an API?

• Yes
• No

If yes, please check if the following requirements are fulfilled

• The Breaking Change or Deprecated label has been added
• The migration steps are described in the following section

What changes might users need to make in their application due to this PR? (migration steps)

Other information:

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[vmouradian]

Support of OuterLoopNames parameters for DC is in this separated PR : #1159.
Can be merged into this branch or to main later