Slowest 20 targets

//src/test/shell/bazel:bazel_bootstrap_distfile_test on macOS (shard 2): PASSED in 1846.3s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on Windows: PASSED in 1597.6s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on CentOS 7: PASSED in 1237.9s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_tar_test on CentOS 7: PASSED in 1235.2s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_tar_test on Ubuntu 20.04 LTS: PASSED in 1149.3s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on Ubuntu 20.04 LTS: PASSED in 1147.3s (log)
//src/test/shell/bazel:bazel_determinism_test on CentOS 7: PASSED in 1140.8s (log)
//src/test/shell/bazel:bazel_determinism_test on Ubuntu 20.04 LTS: PASSED in 1083.0s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on Ubuntu 22.04 LTS: PASSED in 1064.2s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_tar_test on Ubuntu 22.04 LTS: PASSED in 1039.3s (log)
//src/test/shell/bazel/remote:remote_execution_http_test on Ubuntu 20.04 LTS: FLAKY in 1 out of 2 runs in 1006.8s (900.7s + 106.0s) (log)
//src/test/shell/bazel:bazel_determinism_test on Ubuntu 22.04 LTS: PASSED in 980.4s (log)
//src/test/shell/bazel:bazel_coverage_cc_head_test_gcc on Ubuntu 20.04 LTS: FLAKY in 2 out of 3 runs in 760.5s (301.8s + 301.1s + 157.6s) (log)
//src/test/shell/bazel:bazel_determinism_test on macOS arm64 (shard 1): PASSED in 635.7s (log)
//src/test/py/bazel:bazel_windows_cpp_test on Windows: PASSED in 614.4s (log)
//src/test/shell/bazel:bazel_coverage_cc_released_test_gcc on Ubuntu 20.04 LTS: FLAKY in 1 out of 2 runs in 586.3s (301.7s + 284.6s) (log)
//src/test/py/bazel:bazel_module_test on Windows: PASSED in 567.8s (log)
//src/test/shell/bazel:bazel_coverage_java_jdk17_toolchain_released_test on CentOS 7: PASSED in 565.8s (log)
//src/test/shell/integration:target_compatible_with_test on Windows: PASSED in 554.7s (log)
//src/test/shell/integration:build_event_stream_test (shard 2/2) on Ubuntu 22.04 LTS: PASSED in 541.5s (log)

Bazel

Extract the encoding/decoding logic for PersistentMap into a separate MapCodec class.

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