fix: sigv4 now correctly trims spaces (#799)

* fix: sigv4 now correctly trims spaces
add: test for space trimming
add: s3 signing integration test
add: lambda signing integration test

* update: lambda signing test to skip lines that cause an InvalidSignatureException

* add: tests for trim_all
add: missing LICENSE for BLNS

* fix: outdated use statements

* fix: clippy err

* add: missing dep to dynamodb bench
update: ignore naughty strings tests that require real aws connection
fix: s3 naughty strings metadata signing test

* update: move blns to work with our testing process
remove: circular dep aws-config from integration testing crates
update: comment out tests not runnable by CI
format: run cargo fmt

* update: signature snapshot
update: hide lambda tests from integration runner

* update: SDK Changelog

* add: proptest for normalize_header_value
add: proptest for trim_all
update: convert trimming to work on byte slices instead of strings
update: update trimming test to use byte slices

* fix: overly permissive whitespace check
update: test_trim_all_ignores_other_forms_of_whitespace to be more robust
update: use indexes over iterators in an attempt to appease the optimizer
update: test_s3_signer_with_naughty_string_metadata expected signature

* update: test_signer expected signature