feat: tlsping and tcpping using step-by-step (#815)

## Checklist

- [x] I have read the [contribution guidelines](https://github.com/ooni/probe-cli/blob/master/CONTRIBUTING.md)
- [x] reference issue for this pull request: https://github.com/ooni/probe/issues/2158
- [x] if you changed anything related how experiments work and you need to reflect these changes in the ooni/spec repository, please link to the related ooni/spec pull request: https://github.com/ooni/spec/pull/250

## Description

This diff refactors the codebase to reimplement tlsping and tcpping
to use the step-by-step measurements style.

See docs/design/dd-003-step-by-step.md for more information on the
step-by-step measurement style.

internal/measurexlite/logger.go

@@ -0,0 +1,16 @@
+package measurexlite
+
+//
+// Logging support
+//
+
+import "github.com/ooni/probe-cli/v3/internal/measurex"
+
+// TODO(bassosimone): we should eventually remove measurex and
+// move the logging code from measurex to this package.
+
+// NewOperationLogger is an alias for measurex.NewOperationLogger.
+var NewOperationLogger = measurex.NewOperationLogger
+
+// OperationLogger is an alias for measurex.OperationLogger.
+type OperationLogger = measurex.OperationLogger