Refs #35440 -- Optimized parse_header_parameters() for the simplest case.

Added a fast-path to parse_header_parameters
Benchmark results (50,000 iterations):
- Simple headers: ~73% improvement

Thanks Nick Pope (@ngnpope) for the review.

Author: p-r-a-v-i-n

django/utils/http.py

@@ -342,6 +342,10 @@ def parse_header_parameters(line, max_length=MAX_HEADER_LENGTH):
     if max_length is not None and len(line) > max_length:
         raise ValueError("Unable to parse header parameters (value too long).")
 
+    # Fast path for no params.
+    if ";" not in line:
+        return line.strip().lower(), {}
+
     parts = _parseparam(";" + line)
     key = parts.__next__().lower()
     pdict = {}