feat: initial bun support (#24464)

lib/modules/manager/api.ts

lib/modules/manager/bun/artifacts.spec.ts

lib/modules/manager/bun/artifacts.ts

lib/modules/manager/bun/extract.spec.ts

lib/modules/manager/bun/extract.ts

lib/modules/manager/bun/index.ts

lib/modules/manager/bun/readme.md

lib/modules/manager/types.ts

lib/util/exec/containerbase.ts

lib/workers/repository/extract/index.ts

lib/workers/repository/extract/supersedes.spec.ts

lib/workers/repository/extract/supersedes.ts

lib/workers/repository/extract/types.ts