feat(gnoweb): support required attribute for markdown form fields

[moonia]

Description

Closes #4970
This PR adds support for the required="true" attribute in Gno-flavored markdown form fields.

Usage

• required="true" can be added to: <gno-input>, <gno-textarea>, <gno-select>
• Required fields: display a * indicator next to the label

<gno-form>
    <gno-textarea name="bio" required="true" />
</gno-form>

Preview

[Gno2D2]

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Changes related to gnoweb must be reviewed by its codeowners

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Pending initial approval by a review team member, or review from tech-staff

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[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 26 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/gnoweb/markdown/ext_forms.go	33.33%	18 Missing and 8 partials ⚠️

📢 Thoughts on this report? Let us know!

[MikaelVallenet]

why add this here ?

[moonia]

safety but it is indeed redundant, so I will remove it

[moonia]

425f5b9

[Davphla]

LGTM, required field are also enforced when there's no input value.
/!\ CI is not passing

[notJoon]

The required flag only controls whether the required attr is added or not, and all other user unputs are properly handled with HTMLEscapeString, so there doesn't appear to be any injection threat in this PR. LGTM

EDIT: Some CIs are failing now. could you check this if possible? thank you

[jeronimoalbi]

Maybe required form fields could be parsed to render with the required attribute, that way forms would get basic default browser validation on submit click, if it makes sense