Feat: add MD render options when gitee import

Related issue: https://jihulab.com/gitlab-cn/gitlab/-/issues/1855

What does this MR do and why?

• Render Markdown with special option
• Add option when gitee importing

markdown filter

Gem 中默认的 markdown filter

html-pipeline-2.13.2/lib/html/pipeline/markdown_filter.rb

# require 'html/pipeline'

HTML::Pipeline::MarkdownFilter.new("start\nend.").call

# output
# "<p>start<br />\nend.</p>"

GitLab 定制的 markdown filter:

lib/banzai/filter/markdown_filter.rb

# in rails console
Banzai::Filter::MarkdownFilter.new("start\nend.", {markdown_engine: :common_mark}).call

# output
# "<p data-sourcepos=\"1:1-2:4\">start\nend.</p>"

commonmarker Gem

lib/banzai/filter/markdown_engines/common_mark.rb

# `CommonMark` markdown engine for GitLab's Banzai markdown filter.
# This module is used in Banzai::Filter::MarkdownFilter.
# Used gem is `commonmarker` which is a ruby wrapper for libcmark (CommonMark parser)
# including GitHub's GFM extensions.
# We now utilize the renderer built in `C`, rather than the ruby based renderer.
# Homepage: https://github.com/gjtorikian/commonmarker

# require 'commonmarker'

CommonMarker.render_html(text, :DEFAULT)

# output
# "<p>start\nend.</p>\n"

CommonMarker.render_html(text, [:HARDBREAKS])

# output
# "<p>start<br />\nend.</p>\n"

Import demo repo

• https://gitee.com/wwwicbd/import-gitee

Screenshots

original issue description in markdown

https://jihulab.com/gitlab-cn/gitlab/-/issues/1855

Line start;
line end.

We want to `keep \n in code block`.


| header A | header B|
| ------ | ------ |
| cell 1 | cell 2|
| cell 3 | cell 4|

```ruby
      def self.html_pipeline
        @html_pipeline ||= HTML::Pipeline.new(filters)
      end
```

Issue imported from Gitee	Issue in local repo (Not from Gitee)