Add group privileges (for bitbucket v1.0)

[cgroschupp]

The group-privileges endpoints live in the deprecated Bitbucket Cloud REST API version 1.
But there is no equivalent endpoint in 2.0, see more details on:
https://support.atlassian.com/bitbucket-cloud/docs/group-privileges-endpoint/

[ktrysmt]

The go-bitbucket will not support bitbucket v1.

https://github.com/ktrysmt/go-bitbucket#support-bitbucket-api-v10-

Though operation codes about "ApiBaseURL" looks good, would you split the codes to apiBaseURL and privilege group if you agree. @cgroschupp

[cgroschupp]

Temporary support for limited 1.0 API resources

The 2.0 REST API will rely on the Atlassian Cloud Admin API for user and group management, but those API endpoints are not >yet available. Until the Atlassian platform services are fully available in Bitbucket we will continue to support these 1.0 REST >endpoints:

/1.0/groups
/1.0/group-privileges
/1.0/invitations
/1.0/users/{accountname}/invitations

Especially the "group-privileges" endpoint is an important feature and I think this libary should support all cases for Bitbucket Cloud. When it is available in v2, i will change it.

[ktrysmt]

That's sounds good. I understood. @cgroschupp

[cgroschupp]

@ktrysmt rebase is done

[zahiar]

@ktrysmt any thoughts on getting this merged in? I think it will be pretty useful to have, plus I'll happily add support for groups themselves https://support.atlassian.com/bitbucket-cloud/docs/groups-endpoint/#Overview since that is something I'm currently looking at.

I know they are deprecated v1.0 APIs but given how they were deprecated in 2018, and we're close to 2022, I don't think it's a priority for Atlassian to give us v2.0 equivalent APIs 😢