enhance metadata with status (pending/ completed) and annotations.count

[linuxcaffe]

• note: The ability to query based on this metadata, has not yet been implemented. It is a planned hledger enhancement.
  .. so anyways

This is an example of the task-timelog-hook output, as it works now;

i 2021/11/11 17:27:37 it:tw:timelog  develop timelog-hook
o 2021/11/11 17:38:21  ; github:, uuid: fb77148d-c48b-454c-a978-bb846db6f7e

and this is the desired output with enhanced metadata and trimmed (short) uuid

i 2021/11/11 17:27:37 it:tw:timelog  * (2) develop timelog-hook
o 2021/11/11 17:38:21  ; github:, uuid: fb77148d-c48b

Piggy-backing on regular (h)ledger syntax, the description-part starts with " * " indicating status:pending ( ! would indicate status:completed) and the (2) indicates that the task has 2 annotations. If #4 were implemented, then subsequent timelog entries would increment this count, and otherwise very-similar-looking timelog entries would be clearly differentiated.