Better handling of redis span/breadcrumb data

[antonpirker]

This PR updates handling of data in the redis SDK:

• Arguments of the redis AUTH command is never collected (because it contains username and password)
• When send_default_pii=False the arguments of all redis commands are redacted (except the first parameter, because it is always the "key" and thus important for debugging
• Span descriptions and breadcrumb message are truncated to a max size of 1024 (the max size can be configured in a new argument to RedisIntegration(max_data_size=30) (if max_data_size is set to a falsie value (0 or None) then no truncation is done)

Fixes #2023

[Swatinem]

lgtm, though I believe keys can also contain PII, like user ids and such, though probably not security sensitive things.