publisher: Exclude comment and doctype elements from writeStats

[dirkolbrich]

• Reorder code blocks
• Rename cssClassCollectorWriter to htmlElementCollectorWriter, as it just collect html element information
• Expand benchmark to test for minified and unminified content

Fixes #8396, Fixes #8417

I somehow messed up the code review and my following additions with squashing theses commits into the original pull request. Thats why this PR is reopened.

With the original bench test, this PR compares:

➜  publisher git:(master) benchstat ~/old.txt ~/new.txt 
name                    old time/op    new time/op    delta
ClassCollectorWriter-8    24.4µs ± 1%    23.9µs ± 1%   -2.03%  (p=0.000 n=10+9)

name                    old alloc/op   new alloc/op   delta
ClassCollectorWriter-8    35.0kB ± 0%    34.4kB ± 0%   -1.83%  (p=0.000 n=10+10)

name                    old allocs/op  new allocs/op  delta
ClassCollectorWriter-8       155 ± 0%       139 ± 0%  -10.32%  (p=0.000 n=10+10)

When the bench tests on master are expanded to the new version (see branch htmlcollector-bench), the comparison is even more favorable:

➜  publisher git:(master) benchstat ~/old2.txt ~/new.txt
name                                       old time/op    new time/op    delta
ClassCollectorWriter-8                       24.5µs ± 1%    23.9µs ± 1%   -2.53%  (p=0.000 n=9+9)
ElementsCollectorWriter-8                    71.7µs ± 1%    68.2µs ± 2%   -4.94%  (p=0.000 n=10+10)
ElementsCollectorWriterMinified-8            71.6µs ± 0%    68.0µs ± 0%   -5.13%  (p=0.000 n=9+10)
ElementsCollectorWriterWithMinifyStream-8    96.9µs ± 1%    94.0µs ± 1%   -3.04%  (p=0.000 n=10+9)
ElementsCollectorWriterWithMinifyString-8    97.0µs ± 0%    93.4µs ± 1%   -3.76%  (p=0.000 n=10+10)

name                                       old alloc/op   new alloc/op   delta
ClassCollectorWriter-8                       35.0kB ± 0%    34.4kB ± 0%   -1.82%  (p=0.000 n=10+10)
ElementsCollectorWriter-8                     109kB ± 0%     102kB ± 0%   -6.33%  (p=0.000 n=10+9)
ElementsCollectorWriterMinified-8             110kB ± 0%     103kB ± 0%   -6.28%  (p=0.000 n=9+10)
ElementsCollectorWriterWithMinifyStream-8     112kB ± 0%     105kB ± 0%   -6.22%  (p=0.000 n=10+10)
ElementsCollectorWriterWithMinifyString-8     115kB ± 0%     108kB ± 0%   -5.97%  (p=0.000 n=10+10)

name                                       old allocs/op  new allocs/op  delta
ClassCollectorWriter-8                          155 ± 0%       139 ± 0%  -10.32%  (p=0.000 n=10+10)
ElementsCollectorWriter-8                       418 ± 0%       350 ± 0%  -16.27%  (p=0.000 n=10+10)
ElementsCollectorWriterMinified-8               419 ± 0%       352 ± 0%  -15.99%  (p=0.000 n=10+10)
ElementsCollectorWriterWithMinifyStream-8       442 ± 0%       375 ± 0%  -15.16%  (p=0.000 n=10+10)
ElementsCollectorWriterWithMinifyString-8       450 ± 0%       383 ± 0%  -14.89%  (p=0.000 n=10+10)

[dirkolbrich]

#8431

[bep]

I made some minor tweaks and merged this manually, great job, much appreciated!

[github-actions]

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