add prometheus metrics endpoint

cmd/task/main.go

go.mod

go.sum

internal/config/config.go

vendor/github.com/beorn7/perks/LICENSE

vendor/github.com/beorn7/perks/quantile/exampledata.txt

vendor/github.com/beorn7/perks/quantile/stream.go

vendor/github.com/cespare/xxhash/v2/LICENSE.txt

vendor/github.com/cespare/xxhash/v2/README.md

vendor/github.com/cespare/xxhash/v2/xxhash.go

vendor/github.com/cespare/xxhash/v2/xxhash_amd64.go

vendor/github.com/cespare/xxhash/v2/xxhash_amd64.s

vendor/github.com/cespare/xxhash/v2/xxhash_other.go

vendor/github.com/cespare/xxhash/v2/xxhash_safe.go

vendor/github.com/cespare/xxhash/v2/xxhash_unsafe.go

vendor/github.com/golang/protobuf/AUTHORS

vendor/github.com/golang/protobuf/CONTRIBUTORS

vendor/github.com/golang/protobuf/LICENSE

vendor/github.com/golang/protobuf/proto/buffer.go

vendor/github.com/golang/protobuf/proto/defaults.go