Add EpicsService

Epics were introduced in GitLab Ultimate 10.2

GitLab docs: https://docs.gitlab.com/ee/api/epics.html

Add ApprovalsBeforeMerge attribute

Fixed multiple scope jobs selection

At the moment if we provide multiple scopes in listprojectjobs request, the library returns jobs with the last provided state in the scope list.
This is because the scope parameter should have braces in its name as shown in the example: https://docs.gitlab.com/ee/api/jobs.html#list-pipeline-jobs

fix DeletePipelineSchedule always returning an error due to EOF

Gitlab API returns 204 on DELETE endpoints. Trying to read out the pipeline schedule from the delete response will always fail. This changes the DeletePipelineSchedule function to behave similar as the DeletePipelineTrigger function

Adds ResolveOutdatedDiffDiscussions to Project struct

Fixed the GetIssuesClosedOnMerge path (previously resulted in a 404 error)

Add support for creating issue boards

Update GetCommit entity fields

I wanted to leverage this API call, but it was missing data that I'd
like to use. I've added the fields and a test case.

For the test case, I've removed the timestamps as it made the code a bit
ugly. But the rest is fully covered.

feat(projects): Add mirror values to CreateProjectOptions

Update ListGroupProjectsOptions to match API

Instead of using ListProjectsOptions, ListGroupProjectsOptions now
matches the specific options defined for ListGroupProjects() in the API.

add external wiki service

Co-Authored-By: itscaro <itscaro@users.noreply.github.com>

Co-Authored-By: itscaro <itscaro@users.noreply.github.com>

add fields to IssueEvent and update basic tests

Signed-off-by: Minh-Quan TRAN <account@itscaro.me>

Signed-off-by: Minh-Quan TRAN <account@itscaro.me>

Signed-off-by: Minh-Quan TRAN <account@itscaro.me>

 according to the documentation, UpdatedByID field in MergeEvent should be a slice of int

Signed-off-by: Minh-Quan TRAN <account@itscaro.me>

Signed-off-by: Minh-Quan TRAN <account@itscaro.me>