Extract mapped-range key codec into MappedKeyPlan

[tclinkenbeard-oai]

Summary

• Extract mapped-range mapper parsing and key construction into a private MappedKeyPlan within the storage-server component.
• Preserve escaped literals, key/value tuple substitutions, range markers, error handling, and mapped-key ownership.
• Extend mapped-key coverage to verify that key and value tuples are decoded only when the mapper references them.

This helps to reduce the size of the large storageserver.cpp file.

Validation

• fdbserver_storageserver_test
• fdbserver_storageserver_test -f /fdbserver/storageserver/constructMappedKey

[foundationdb-ci]

Result of foundationdb-pr-macos-m1 on macOS 14.x

• Commit ID: c5e506a
• Duration 0:34:43
• Result: ✅ SUCCEEDED
• Error: N/A
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[foundationdb-ci]

Result of foundationdb-pr-clang-ide on Linux RHEL 9

• Commit ID: c5e506a
• Duration 0:40:23
• Result: ✅ SUCCEEDED
• Error: N/A
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[foundationdb-ci]

Result of foundationdb-pr-clang-arm on Linux RHEL 9

• Commit ID: c5e506a
• Duration 0:47:28
• Result: ✅ SUCCEEDED
• Error: N/A
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[foundationdb-ci]

Result of foundationdb-pr-macos on macOS 14.x

• Commit ID: c5e506a
• Duration 0:49:53
• Result: ✅ SUCCEEDED
• Error: N/A
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[foundationdb-ci]

Result of foundationdb-pr on Linux RHEL 9

• Commit ID: c5e506a
• Duration 1:07:58
• Result: ✅ SUCCEEDED
• Error: N/A
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[foundationdb-ci]

Result of foundationdb-pr-clang on Linux RHEL 9

• Commit ID: c5e506a
• Duration 1:17:56
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
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[foundationdb-ci]

Result of foundationdb-pr-cluster-tests on Linux RHEL 9

• Commit ID: c5e506a
• Duration 1:35:57
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)
• Cluster Test Logs zip file of the test logs (available for 30 days)