Follow-up to #954, which added the same for the non-paging request already.

If pipelines have a large amount of jobs (> 100 at least), need to use
the paging API to get all jobs (as GitLab limits paging size to max. 100).
JobApi didn't support the include_retried flag yet, in the methods that
support paging (i.e. those that return Pager<Job>/Stream<Job>)

This adds possibility to identify erased jobs.

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Co-authored-by: Konstantin Hintermayer <konstantin@handig-eekhoorn.at>
Co-authored-by: Jeremie Bresson <jeremie.bresson@unblu.com>

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Co-authored-by: Jeremie Bresson <jeremie.bresson@unblu.com>

Co-authored-by: Jeremie Bresson <jeremie.bresson@unblu.com>

Fixes #992

Fixes #1006

Co-authored-by: Jan Henrik Wiesner <jan.wiesner@gebit.de>
Co-authored-by: Jeremie Bresson <jeremie.bresson@unblu.com>

Fixes #1009

Co-authored-by: t.mucs <t.mucs@4flow.de>

Fixes #984

Changes MergeRequestApi:

- added methods "getDiffs()" for GitLab Endpoint:
GET /projects/:id/merge_requests/:merge_request_iid/diffs

- add methods "getDiffVersions()" for GitLab Endpoint:
GET /projects/:id/merge_requests/:merge_request_iid/versions

- add method "getDiffVersion()" and "getOptionalDiffVersion()" for GitLab Endpoint:
GET /projects/:id/merge_requests/:merge_request_iid/versions/:version_id

- deprecate "getMergeRequestDiffs()" and "getMergeRequestDiff()"

Fixes #993

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Co-authored-by: Jeremie Bresson <jeremie.bresson@unblu.com>

Correct JavaDoc for "protectTag" method to show actual information of GitLab endpoint method.

Co-authored-by: Усачев Дмитрий Дмитриевич <92usachevdd@region.cbr.ru>

Co-authored-by: Jeremie Bresson <jeremie.bresson@unblu.com>

Co-authored-by: Jeremie Bresson <jeremie.bresson@unblu.com>

* Add methods to create child epics

* Add methods to manage related epics

* #954 add include_retried for jobs api

* Apply suggestions from code review

* Fix compile error

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Co-authored-by: vladimir.molodkin <vladimir.molodkin@aliexpress.ru>
Co-authored-by: Jérémie Bresson <dev@jmini.fr>
Co-authored-by: Jeremie Bresson <jeremie.bresson@unblu.com>

* UserApi implement createPersonalAccessToken

* adds missing scopes
* factors out common logic

* Fix integration tests to run with Gitlab "12.9.2-ce.0"

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Co-authored-by: Malte Meister <malte@labs.ws>

* Add missing attributes in EventMergeRequest

* Fix duration and tests

* Update jersey version to 2.39.1

* Update maven enforcer plugin

The GitLab API for Jobs supports - https://docs.gitlab.com/ee/api/jobs.html. Thus adding SKIPPED enumeration.

* Add Automatic-Module-Name manifest entry: `org.gitlab4j.api`

This gets rid of warnings on Java 9+, and makes it safer to use this library as a module.

* Fix Epic Issue link association

Fixes #729

* Change return type

This allows clients to implement custom operation more easily.

* Add support for link type between issues

Fixes #847

* Create AbstractIssue

* Add repository submodules api

Fixes #921

* Fix unit test