gh-118921: Add `copy()` method for `FrameLocalsProxy` #112168

Job	Run time
Check for source changes	10s
Check if generated files are up to date	4m 49s
Address sanitizer	8m 41s
Ubuntu SSL tests with OpenSSL (1.1.1w)	2m 48s
CIFuzz (address)	19m 47s
Ubuntu SSL tests with OpenSSL (3.0.13)	1m 52s
Hypothesis tests on Ubuntu	5m 33s
CIFuzz (undefined)	20m 45s
Ubuntu SSL tests with OpenSSL (3.1.5)	2m 2s
CIFuzz (memory)	20m 5s
Ubuntu SSL tests with OpenSSL (3.2.1)	2m 2s
Windows (free-threading) / build and test (x64)	19m 35s
Windows (free-threading) / build (arm64)	2m 32s
Windows (free-threading) / build and test (x86)	21m 42s
macOS / build and test (macos-14)	8m 32s
macOS / build and test (macos-13)	12m 53s
macOS (free-threading) / build and test (macos-14)	9m 50s
Ubuntu / build and test	7m 16s
Thread sanitizer / Thread sanitizer	4m 42s
Ubuntu (free-threading) / build and test	8m 53s
Windows / build and test (x64)	17m 16s
Windows / build and test (x86)	17m 6s
Windows / build (arm64)	3m 24s
Thread sanitizer (free-threading) / Thread sanitizer	7m 5s
WASI / build and test	12m 18s
Docs / Docs	1m 55s
Docs / Docs (Oldest Sphinx)	1m 47s
Docs / Doctest	15m 1s
All required checks pass	7s
	4h 20m 28s

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