chore(controllers): embed gtime to cut build time

[weisdd]

In #2269, there was the gtime dependency added to parse a wider set of durations. As a consequence, many indirect dependencies were added as well.

When analyzing build time using actiongraph, I've noticed that, on my laptop (8-core M1), all those deps contribute about 30-40 seconds in total, which seems to be too much for just a single function we wanted to use.

To mitigate that, I've prepared a new gtime package that contains only the code related to ParseDuration(). - It's mostly a copy of https://github.com/grafana/grafana-plugin-sdk-go/backend/gtime, but decoupled from https://github.com/grafana/grafana-plugin-sdk-go/backend (backend.DownstreamError) and reformatted according to our current linter/formatter settings.

Of course, the actual effect depends on many factors, but when I measured the build time with clean cache, it dropped from ~233.177s to ~192.593s.

Build stats

0.021s                golang.org/x/exp
0.021s   0.021s       github.com/mattetti/filebuffer
0.024s   0.024s       github.com/mattn/go-colorable
0.024s   0.024s       github.com/mattn/go-isatty
0.027s   0.027s       github.com/clipperhouse/stringish
0.029s                github.com/cheekybits/genny
0.035s   0.035s       github.com/oklog/run
0.036s                github.com/golang/protobuf
0.038s   0.038s         github.com/cenkalti/backoff/v5
0.048s   0.048s       github.com/grafana/otel-profiling-go
0.049s   0.049s         go.opentelemetry.io/contrib/propagators/jaeger
0.050s   0.050s       github.com/mattn/go-runewidth
0.053s   0.053s       github.com/fatih/color
0.074s   0.052s       golang.org/x/xerrors
0.074s   0.074s       github.com/hashicorp/yamux
0.077s                  github.com/clipperhouse/uax29/v2
0.078s   0.078s       github.com/olekukonko/tablewriter
0.090s   0.090s           github.com/grpc-ecosystem/go-grpc-middleware/providers/prometheus
0.093s                github.com/google/flatbuffers
0.096s   0.096s       github.com/jszwedko/go-datemath
0.099s                github.com/gogo/googleapis
0.100s                  github.com/grpc-ecosystem/go-grpc-middleware/v2
0.111s   0.088s             go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc
0.121s   0.121s       github.com/hashicorp/go-hclog
0.123s   0.097s         go.opentelemetry.io/contrib/samplers/jaegerremote
0.139s   0.039s         github.com/grafana/pyroscope-go/godeltaprof
0.153s   0.153s       github.com/zeebo/xxh3
0.155s   0.070s               go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace
0.272s   0.068s         github.com/pierrec/lz4/v4
0.421s   0.084s             go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc
0.578s   0.025s       go.opentelemetry.io/otel/sdk
0.965s   0.717s       github.com/hashicorp/go-plugin
1.020s                github.com/jaegertracing/jaeger-idl
1.707s                github.com/grafana/grafana-plugin-sdk-go
2.916s                  github.com/apache/arrow-go/v18
20.423s   0.041s       github.com/goccy/go-json

~30.34s (doesn't include linking and waiting).

[Baarsgaard]

The binary size also shrinks! 95Mi -> 81Mi

[weisdd]

@Baarsgaard ah, that's nice! I've completely forgotten to check the binary size, thanks for highlighting that :)