feat(diagnostics): add pprof profiling (#1627)

* feat(tracing): enable tracing

* of course the squash didn't work.

* gah. always nice when there's 40 csets.

* might as well.

* refactor: tracing to diagnostics

* feat: add note about the magic methods from pprof

---------

Co-authored-by: ze0s <ze0s@riseup.net>

internal/domain/config.go

@@ -24,6 +24,9 @@ type Config struct {
 	PostgresPass        string `toml:"postgresPass"`
 	PostgresSSLMode     string `toml:"postgresSSLMode"`
 	PostgresExtraParams string `toml:"postgresExtraParams"`
+	ProfilingEnabled    bool   `toml:"profiling"`
+	ProfilingHost       string `toml:"profilingHost"`
+	ProfilingPort       int    `toml:"profilingPort"`
 }
 
 type ConfigUpdate struct {