[Amazon.Lambda.RuntimeSupport] fix: Find header key with insensitive comparison#2094

GarrettBeatty merged 5 commits intoaws:devaws/aws-lambda-dotnet:devfrom

duncanista:jordan.gonzalez/runtime-support/case-insensitive-header-key-lookupduncanista/aws-lambda-dotnet:jordan.gonzalez/runtime-support/case-insensitive-header-key-lookupCopy head branch name to clipboard