fix(cli-tools): Value required for --partition in stream subscribe

[teogeb]

Users must provide a partition value when using the --partition flag. If the value is omitted, the command now shows a descriptive error message.

There are no changes to the optionality of the flag: it is still ok to leave it out, in which case the command defaults to partition 0, just like before this PR.

Error

Before this PR we got this error like this when using the flag without a value:

Error: invalid streamPartition value: true
    at ensureValidStreamPartitionIndex (.../network/packages/utils/dist/src/partition.js:10:15)

Now we show standard commander error:

error: option '-p, --partition <partition>' argument missing

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