Fix compile on libretiny due to round macro conflict

- Now obey the spec
- Uses a static parse method
- Support move semantic

Fixed Header parsing

Arduino Core 3.2.1

ESP32Async/AsyncTCP @ 3.4.5

* ETag and caching for serving pre‐compressed files

This PR introduces ETag handling and caching improvements for serving pre‐compressed .gz files, enabling conditional GET responses to optimize bandwidth and server resource usage.
Adds ETag header generation based on the CRC32 checksum from the gzip trailer.
Implements conditional 304 responses in the send() method when the client's ETag matches the server's.
Enhances both asynchronous file response handling and web server request processing for .gz files.

* Add files via upload

* ci(pre-commit): Apply automatic fixes

* Make _getEtag a private method

Make private: static void _getEtag(uint8_t trailer[4], char *serverETag)

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Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

* set default value for '_onDisconnectfn'

* ci(pre-commit): Apply automatic fixes

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Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

* Support for pre-compressed and ETag in download 

When downloading file request:
1. **Gzipped file serving**:
   - Automatically detects and serves pre-compressed `.gz` files when uncompressed originals are missing
   - Properly sets `Content-Encoding: gzip` headers
   - Implements `If-None-Match` header comparison for 304 (Not Modified) responses (RFC 7232)
   - Implements `ETag` header using CRC-32 from gzip trailer (bytes 4-7 from end)
   - Optimize for speed
Changes affect:
void AsyncWebServerRequest::send(FS &fs, const String &path, const char *contentType, bool download, AwsTemplateProcessor callback) 
AsyncWebServerResponse *
  AsyncWebServerRequest::beginResponse(FS &fs, const String &path, const char *contentType, bool download, AwsTemplateProcessor callback) 
AsyncFileResponse::AsyncFileResponse(FS &fs, const String &path, const char *contentType, bool download, AwsTemplateProcessor callback)
  : AsyncAbstractResponse(callback)

* ci(pre-commit): Apply automatic fixes

* Update src/AsyncWebServerRequest.cpp

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Add files via upload

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Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Optimize _setContentTypeFromPath method with a more efficient version (_setContentTypeFromPath_v3) that uses C-string comparison (strcmp) instead of String::endsWith.
This change improves performance and reduces memory usage,
Common web extensions are checked first to speed up typical lookups.

Version 1 (original):    16.9789 μs per call
Version 2 (strcmp):      6.7527 μs per call

Optimize content type detection using C-strings