refactor(parser): merge 'AdmonitionParagraph' and 'Paragraph' rules

[xcoulon]

also, rename ListElementContinuation
to ListContinuation

[github-actions]

Comparing with master branch:

name                                          old time/op    new time/op    delta
RealDocumentProcessing/demo.adoc-2              17.9ms ± 1%    17.9ms ± 1%   ~     (p=0.546 n=9+9)
RealDocumentProcessing/vertx-examples.adoc-2    52.8ms ± 1%    53.2ms ± 3%   ~     (p=0.905 n=9+10)
RealDocumentProcessing/mocking.adoc-2           48.4ms ± 0%    49.2ms ± 3%   ~     (p=0.105 n=10+10)

name                                          old alloc/op   new alloc/op   delta
RealDocumentProcessing/demo.adoc-2              9.34MB ± 0%    9.34MB ± 0%   ~     (p=0.579 n=10+10)
RealDocumentProcessing/vertx-examples.adoc-2    26.0MB ± 0%    26.0MB ± 0%   ~     (p=1.000 n=8+10)
RealDocumentProcessing/mocking.adoc-2           21.7MB ± 0%    21.7MB ± 0%   ~     (p=0.088 n=7+10)

name                                          old allocs/op  new allocs/op  delta
RealDocumentProcessing/demo.adoc-2                113k ± 0%      113k ± 0%   ~     (all equal)
RealDocumentProcessing/vertx-examples.adoc-2      332k ± 0%      332k ± 0%   ~     (p=0.589 n=10+10)
RealDocumentProcessing/mocking.adoc-2             328k ± 0%      328k ± 0%   ~     (p=0.103 n=10+7)

Comparing with latest release:

name                                          old time/op    new time/op    delta
RealDocumentProcessing/demo.adoc-2              17.9ms ± 1%    17.1ms ± 1%  -4.57%  (p=0.000 n=9+9)
RealDocumentProcessing/vertx-examples.adoc-2    52.8ms ± 1%    48.2ms ± 1%  -8.83%  (p=0.000 n=9+10)
RealDocumentProcessing/mocking.adoc-2           48.4ms ± 0%    47.5ms ± 1%  -1.91%  (p=0.000 n=10+10)

name                                          old alloc/op   new alloc/op   delta
RealDocumentProcessing/demo.adoc-2              9.34MB ± 0%    8.85MB ± 0%  -5.20%  (p=0.000 n=10+10)
RealDocumentProcessing/vertx-examples.adoc-2    26.0MB ± 0%    24.0MB ± 0%  -7.91%  (p=0.000 n=8+10)
RealDocumentProcessing/mocking.adoc-2           21.7MB ± 0%    21.6MB ± 0%  -0.56%  (p=0.000 n=7+8)

name                                          old allocs/op  new allocs/op  delta
RealDocumentProcessing/demo.adoc-2                113k ± 0%      106k ± 0%  -6.01%  (p=0.000 n=9+10)
RealDocumentProcessing/vertx-examples.adoc-2      332k ± 0%      305k ± 0%  -8.18%  (p=0.000 n=10+7)
RealDocumentProcessing/mocking.adoc-2             328k ± 0%      326k ± 0%  -0.56%  (p=0.000 n=10+10)

[codecov]

Codecov Report

Merging #1031 (04c7a1e) into master (d602a4a) will decrease coverage by 0.06%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master    #1031      +/-   ##
==========================================
- Coverage   80.29%   80.23%   -0.07%     
==========================================
  Files          86       86              
  Lines        7013     7017       +4     
==========================================
- Hits         5631     5630       -1     
- Misses        861      866       +5     
  Partials      521      521