feat: search functions for group, project and roles

[vlnevyhosteny]

What type of PR is this?

• feature
• deprecation

What this PR does / why we need it:

• features Find function for Groups (https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-groups/#api-rest-api-3-groups-picker-get)
• features GetGroupMembers to get members of a group by GroupID. Added as a new function to not create breaking change.
• features Find function for Projects (https://developer.atlassian.com/cloud/jira/platform/rest/v2/api-group-projects/#api-rest-api-2-project-search-get). GetAll project marked as deprecated (see https://developer.atlassian.com/cloud/jira/platform/rest/v2/api-group-projects/#api-rest-api-2-project-get)
• features GetRoleActorsForProject
• features searching.go that contains search functions (With...) that are shared by multiple services.