tempo-cli: add support for dropping multiple traces in single operation

[electron0zero]

We currently have a command in tempo-cli under rewrite-blocks drop-trace to delete a single trace from a block.

However, there are scenarios where operators may need to drop multiple traces from a single block.
To achieve this now, they must loop through the list of trace IDs and execute the drop-trace command. This is inefficient, as it requires rewriting the same block multiple times (pulling and uploading the same block to backend) when dropping several traces.

I propose adding a new command (or updating the current one) to accept a list of trace IDs to delete multiple traces from a block in a single operation.

[ndk]

How about letting to specify multiple trace IDs separated by commas?

tempo-cli rewrite-blocks drop-trace --backend=local --bucket=./data --drop-trace traceid1 single-tenant
tempo-cli rewrite-blocks drop-trace --backend=local --bucket=./data --drop-trace traceid1,traceid2 single-tenant
tempo-cli rewrite-blocks drop-trace --backend=local --bucket=./data --drop-trace traceid1,traceid2,traceid3 single-tenant

BTW, I found some discrepancies between the documentation and the implementation. The difference is in the order of arguments.

[electron0zero]

I am good on passing the multiple traceIDs via comma to the current command instead of adding a new command, very valid approach and gets the job done.

To better indicate that it can take multiple traceIDs, we are rename the command to be plural (from drop-trace to drop-traces)

will leave more feedback on the PR when it's out of draft and ready for review.