http1 support in e2e test request signing

[mxfactorial]

Issue #, if available:

Description of changes:

awslabs/aws-sdk-rust#1041 enables switching apply_to_request_http0x to apply_to_request_http1x

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[bnusunny]

Thanks!

[bnusunny]

I have a few comments. Could you take a look?

[bnusunny]

And please also fix the lint issue

[mxfactorial]

ready

❯ make fmt && make lint && make test
cargo fmt --all -- --check
cargo clippy -- -Dwarnings
    Checking lambda_web_adapter v0.8.1 (/Users/mx/code/aws-lambda-web-adapter)
    Finished dev [unoptimized + debuginfo] target(s) in 0.65s
cargo nextest run
warning: ignoring unknown configuration keys in config file /Users/mx/code/aws-lambda-web-adapter/.config/nextest.toml: profile.ci.inherits
   Compiling lambda_web_adapter v0.8.1 (/Users/mx/code/aws-lambda-web-adapter)
    Finished test [unoptimized + debuginfo] target(s) in 3.13s
    Starting 18 tests across 4 binaries (4 skipped)
        PASS [   0.251s] lambda_web_adapter tests::test_status_200_is_ok
        PASS [   0.249s] lambda_web_adapter tests::test_status_500_is_bad
        PASS [   0.244s] lambda_web_adapter::integ_tests test_http_content_encoding_suffix
        PASS [   0.247s] lambda_web_adapter::integ_tests test_http_basic_request
        PASS [   0.246s] lambda_web_adapter::integ_tests test_http_compress
        PASS [   0.249s] lambda_web_adapter::integ_tests test_adapter_options_from_env
        PASS [   0.245s] lambda_web_adapter::integ_tests test_http_compress_disallowed_type
        PASS [   0.246s] lambda_web_adapter::integ_tests test_http_compress_already_compressed
        PASS [   0.248s] lambda_web_adapter::integ_tests test_adapter_options_from_namespaced_env
        PASS [   0.250s] lambda_web_adapter tests::test_status_403_is_bad_when_configured
        PASS [   0.223s] lambda_web_adapter::integ_tests test_http_context_headers
        PASS [   0.086s] lambda_web_adapter::integ_tests test_http_context_multi_headers
        PASS [   0.070s] lambda_web_adapter::integ_tests test_http_headers
        PASS [   0.086s] lambda_web_adapter::integ_tests test_http_path_encoding
        PASS [   0.069s] lambda_web_adapter::integ_tests test_http_post_put_delete
        PASS [   0.059s] lambda_web_adapter::integ_tests test_http_query_params
        PASS [   0.059s] lambda_web_adapter::integ_tests test_http_readiness_check
        PASS [   0.055s] lambda_web_adapter::integ_tests test_readiness_check_port_fallback_to_lwa_port
------------
     Summary [   0.323s] 18 tests run: 18 passed, 4 skipped