chore: refactor plugin name

[alexander-akait]

What kind of change does this PR introduce?

Refactor and move plugin name to own const.

Why?

• less indentation and better readable
• ability to reuse plugin name for loggers/caches
• easy to rename plugin - less mistakes when we forgot to change plugin name in hooks

Did you add tests for your changes?

Existing

Does this PR introduce a breaking change?

No

What needs to be documented once your changes are merged?

No need

[github-actions]

Benchmarks:

• "devtool-source-map": HEAD (2eff6cb) 674 ms ± 49 ms [662 ms; 685 ms] (49 runs)
• "devtool-source-map": BASE (d988515) 667 ms ± 42 ms [657 ms; 677 ms] (49 runs)
• "devtool-source-map" change: HEAD (674 ms ± 49 ms [662 ms; 685 ms]) is -1% the same as BASE (BASE) (667 ms ± 42 ms [657 ms; 677 ms])

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• "many-chunks": HEAD (2eff6cb) 1115 ms ± 43 ms [1101 ms; 1128 ms] (31 runs)
• "many-chunks": BASE (d988515) 1099 ms ± 49 ms [1084 ms; 1114 ms] (32 runs)
• "many-chunks" change: HEAD (1115 ms ± 43 ms [1101 ms; 1128 ms]) is -1% the same as BASE (BASE) (1099 ms ± 49 ms [1084 ms; 1114 ms])

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• "many-modules": HEAD (2eff6cb) 611 ms ± 29 ms [604 ms; 618 ms] (53 runs)
• "many-modules": BASE (d988515) 613 ms ± 30 ms [606 ms; 620 ms] (53 runs)
• "many-modules" change: HEAD (611 ms ± 29 ms [604 ms; 618 ms]) is 0% the same as BASE (BASE) (613 ms ± 30 ms [606 ms; 620 ms])

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• "popular-libraries": HEAD (2eff6cb) 1515 ms ± 33 ms [1503 ms; 1526 ms] (24 runs)
• "popular-libraries": BASE (d988515) 1562 ms ± 41 ms [1548 ms; 1576 ms] (24 runs)
• "popular-libraries" change: HEAD (1515 ms ± 33 ms [1503 ms; 1526 ms]) is 3% faster than BASE (BASE) (1562 ms ± 41 ms [1548 ms; 1576 ms])

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