Refactor ChangeFeedCommand.actor.cpp for Readability and Modularization

[sanowl]

*Modularized Code**: Separated command handling into individual functions (handleStreamCommand, handlePopCommand).

2. Consistent Error Handling: Improved error handling across functions with detailed error messages.
3. Enhanced Readability: Added comments and improved code structure for better readability.
4. Namespace Usage: Encapsulated helper functions within an unnamed namespace for better encapsulation.

[foundationdb-ci]

Result of foundationdb-pr-clang-arm on Linux CentOS 7

• Commit ID: 70fd69dd6403e6b49c8d66e17daac7891ea27431
• Duration 0:03:02
• Result: :x: FAILED
• Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; exit 1; fi. Reason: exit status 1
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[foundationdb-ci]

Result of foundationdb-pr-clang on Linux CentOS 7

• Commit ID: 70fd69dd6403e6b49c8d66e17daac7891ea27431
• Duration 0:03:38
• Result: :x: FAILED
• Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; exit 1; fi. Reason: exit status 1
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[foundationdb-ci]

Result of foundationdb-pr on Linux CentOS 7

• Commit ID: 70fd69dd6403e6b49c8d66e17daac7891ea27431
• Duration 0:03:42
• Result: :x: FAILED
• Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; exit 1; fi. Reason: exit status 1
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[foundationdb-ci]

Result of foundationdb-pr-clang-ide on Linux CentOS 7

• Commit ID: 70fd69dd6403e6b49c8d66e17daac7891ea27431
• Duration 0:03:43
• Result: :x: FAILED
• Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; exit 1; fi. Reason: exit status 1
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[foundationdb-ci]

Result of foundationdb-pr-macos on macOS Ventura 13.x

• Commit ID: 70fd69dd6403e6b49c8d66e17daac7891ea27431
• Duration 0:04:53
• Result: :x: FAILED
• Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; exit 1; fi. Reason: exit status 1
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[foundationdb-ci]

Result of foundationdb-pr-macos-m1 on macOS Ventura 13.x

• Commit ID: 70fd69dd6403e6b49c8d66e17daac7891ea27431
• Duration 0:05:22
• Result: :x: FAILED
• Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; exit 1; fi. Reason: exit status 1
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[xis19]

FYI: I have sent you a pull request to your repo for the source formatting issue.