Add group name in task metrics (#10196)

* SpawnNamed: add new trait methods

Signed-off-by: Andrei Sandu <[email protected]>

* Implement new methods

Signed-off-by: Andrei Sandu <[email protected]>

* cargo fmt

Signed-off-by: Andrei Sandu <[email protected]>

* SpawnNamed: add new trait methods

Signed-off-by: Andrei Sandu <[email protected]>

* Implement new methods

Signed-off-by: Andrei Sandu <[email protected]>

* cargo fmt

Signed-off-by: Andrei Sandu <[email protected]>

* New approach - spaw() group param

Signed-off-by: Andrei Sandu <[email protected]>

* Update traits: SpawnNamed and SpawnNamed

Signed-off-by: Andrei Sandu <[email protected]>

* Update TaskManager tests

Signed-off-by: Andrei Sandu <[email protected]>

* Update test TaskExecutor

Signed-off-by: Andrei Sandu <[email protected]>

* Fix typo

Signed-off-by: Andrei Sandu <[email protected]>

* grunt work: fix spawn() calls

Signed-off-by: Andrei Sandu <[email protected]>

* cargo fmt

Signed-off-by: Andrei Sandu <[email protected]>

* remove old code

Signed-off-by: Andrei Sandu <[email protected]>

* cargo fmt - the right version

Signed-off-by: Andrei Sandu <[email protected]>

* Implement review feedback

- use Option group name in SpawnNamed methods
- switch to kebab case
- implement default group name
- add group name to some tasks

Signed-off-by: Andrei Sandu <[email protected]>