Add line protocol uint64 support (#3946)

Makefile

metric/metric.go

metric/uint_support.go

plugins/parsers/influx/escape.go

plugins/parsers/influx/handler.go

plugins/parsers/influx/machine.go

plugins/parsers/influx/machine.go.rl

plugins/parsers/influx/machine_test.go

plugins/parsers/influx/parser.go

plugins/parsers/influx/parser_test.go

plugins/serializers/influx/influx.go

plugins/serializers/influx/influx_test.go