Fix query string signing bug (#965)

* update: use shared encoder definition when encoding url paths, query strings
add: query string writer test
add: changelog entry for bugfix

* format: test file

* fix: integration test
add: ", ^, `, \, (space), {, }, and | to list of chars to percent encode

* add: tracing and tracing-subscriber dep to generated integration tests

* add: canonical req query param test
remove: obsolete LABEL_SET ascii set

* fix: outdated aws-hyper import