{@code} / {@literal} inline tag is not rendered correctly in Markdown hover

[subyssurendran666]

This PR fixes an issue where the {@code} inline tag is not rendered correctly in the Markdown hover. It also addresses incorrect handling of the {@literal} tag, which is included as part of the same issue.
In {@literal} tags, below characters are escaped and rendered accordingly.

<>*^&\[]`

Fix: #3672

[fbricon]

Multiline {@code } breaks, e.g.

/// Here's some code {@code 
///     List<String> list = List.of("Hello World!");
/// } 
/// that does something.

While the same in HTML is rendered properly:

/**
 * Here's some code {@code 
 *  List<String> list = List.of("Hello World!");
 * }
 * that does something.
 */

[subyssurendran666]

Thanks for reviewing this PR and for the feedback. I have pushed the latest changes. The third and fourth unit tests (testHoverMarkdownWithCodeTag_03 and testHoverMarkdownWithCodeTag_04) will always fail, since there is a bug in JDT.Core. The above-mentioned tests will succeed once the corresponding PR gets merged.