URL query string values should be redacted by default

[trask]

Fixes #860

Changes

Query string values are now redacted by default due to concerns around leaking sensitive data.

This is not considered a breaking change because the OTel semantic conventions definition of stability specifically allows changing attribute values:

Things not listed in the above are not expected to remain stable via semantic convention and are allowed (or expected) to change. A few examples:

• The values of attributes