feat(stark-core): implement Stark XSRF module

[christophercr]

ISSUES CLOSED: #115

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NationalBankBelgium/stark/blob/master/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[X] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #115

What is the new behavior?

XSRF protection can be enabled now by importing the Stark XSRF module.

In case the Stark XSRF module is imported in the App, then all the Http requests will be sent with withCredentials: true otherwise the browser will not accept the XSRF cookie received from the backend.

Does this PR introduce a breaking change?

[ ] Yes
[X] No

Other information

The json-server configuration from the old Stark can be used to test this new feature.

[coveralls]

Coverage decreased (-0.3%) to 91.288% when pulling e82ed0d on christophercr:feature/xsrf into 8a787f7 on NationalBankBelgium:master.

[SuperITMan]

It seems right

[SuperITMan]

Can you please rebase it ?

[christophercr]

Rebased ;)