feat: drop projects-classic endpoints, add GitHub API endpoints: cache limits (retention & storage) for repos/orgs/enterprises, billing budgets & usage, artifacts deployment metadata, and projectsV2 drafts & fields (#486)

BREAKING CHANGE: Removed `/orgs/{org}/projects`
BREAKING CHANGE: Removed `/orgs/{org}/settings/billing/actions`
BREAKING CHANGE: Removed `/orgs/{org}/settings/billing/packages`
BREAKING CHANGE: Removed `/orgs/{org}/settings/billing/shared-storage`
BREAKING CHANGE: Removed `/orgs/{org}/teams/{team_slug}/projects`
BREAKING CHANGE: Removed `/orgs/{org}/teams/{team_slug}/projects/{project_id}`
BREAKING CHANGE: Removed `/projects/columns/{column_id}`
BREAKING CHANGE: Removed `/projects/columns/{column_id}/moves`
BREAKING CHANGE: Removed `/projects/{project_id}`
BREAKING CHANGE: Removed `/projects/{project_id}/collaborators`
BREAKING CHANGE: Removed `/projects/{project_id}/collaborators/{username}`
BREAKING CHANGE: Removed `/projects/{project_id}/collaborators/{username}/permission`
BREAKING CHANGE: Removed `/repos/{owner}/{repo}/projects`
BREAKING CHANGE: Removed `/teams/{team_id}/projects`
BREAKING CHANGE: Removed `/teams/{team_id}/projects/{project_id}`
BREAKING CHANGE: Removed `/user/projects`
BREAKING CHANGE: Removed `/users/{username}/projects`
BREAKING CHANGE: Removed `/users/{username}/settings/billing/actions`
BREAKING CHANGE: Removed `/users/{username}/settings/billing/packages`
BREAKING CHANGE: Removed `/users/{username}/settings/billing/shared-storage`

Author: octokit[bot]