feat(parser/renderer): support for literal blocks

[xcoulon]

support for literal blocks in the form of:

• a paragraph starting with one or more spaces
• a paragraph surrounded with the .... delimiter
• a parapgrah with the [literal] attribute

Signed-off-by: Xavier Coulon [email protected]

[codecov]

Codecov Report

Merging #29 into master will decrease coverage by 1.04%.
The diff coverage is 66.25%.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   65.99%   64.95%   -1.05%     
==========================================
  Files          19       20       +1     
  Lines        2194     2317     +123     
==========================================
+ Hits         1448     1505      +57     
- Misses        637      700      +63     
- Partials      109      112       +3

Impacted Files	Coverage Δ
parser/asciidoc_parser.go	56.48% <ø> (-1.28%)	⬇️
renderer/html5/renderer.go	86.66% <100%> (+0.25%)	⬆️
types/type_utils.go	71.75% <50%> (ø)	⬆️
renderer/html5/delimited_block.go	66.66% <58.33%> (-11.91%)	⬇️
types/grammar_types.go	66.1% <64%> (-1.36%)	⬇️
renderer/html5/literal_blocks.go	78.57% <78.57%> (ø)

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