create_learningpath web service - refs BT#17453

[sebastiendu]

Moved most learning path creation code from main/lp/learnpath.class.php to CourseBundle/Entity/CLp.php and CLpItem.php.

[FlintCIBot]

Lint errors were found. A patch is also available.

Please see the report: https://flintci.io/repositories/1013/analyses/37551

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[FlintCIBot]

Lint errors were found. A patch is also available.

Please see the report: https://flintci.io/repositories/1013/analyses/37554

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[FlintCIBot]

Lint errors were found. A patch is also available.

Please see the report: https://flintci.io/repositories/1013/analyses/37637

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[NicoDucou]

Ce PR est inclus dans le PR https://github.com/chamilo/chamilo-lms/pull/3372 donc il sera revu directement dans cet autre PR qui contient d'autres Web Services en même temps.

[jmontoyaa]

This PR has code already sent in #3372 and it has the same issues (database changes, core chamilo refactoring)

[FlintCIBot]

Lint errors were found. A patch is also available.

Please see the report: https://flintci.io/repositories/1013/analyses/37789

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[FlintCIBot]

Lint errors were found. A patch is also available.

Please see the report: https://flintci.io/repositories/1013/analyses/39767

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