fix(gnoweb): handle multiline value for gno-textarea in forms

[moonia]

Closes #4968

Description

The <gno-textarea> component was literally displaying the \n sequence. After fix, the parser now interprets the \n sequence as a real newline character.

Example

<gno-form>
  <gno-textarea name="content" value="         First line\nSecond line" />
</gno-form>

Before fix:

After fix:

[Gno2D2]

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[Davphla]

The changes work, but I recommend to also support other special characters (e.g.: \t, which is the only pertinent in our case).
Maybe there's a package that interpret them directly?
Otherwise LGTM

[jefft0]

@moonia , can you add a test for the specific use case in the original issue?

<gno-form>
  <gno-textarea name="content" value="First line\nSecond line" />
</gno-form>