feat(gnoweb): download source

[alexiscolin]

This PR adds a new feature that enables users to directly download source files. A new variable, FileDownload, is added to the source_view component, providing a URL that triggers a raw file download when clicked. This change improves user experience by allowing quick access to the raw source without the additional HTML layout.

• Direct Download Link:
  The source view template now utilizes the .FileDownload variable to render a download link. When clicked, this link invokes the download handler, which returns the raw file content as an attachment.

• Enhanced Routing:
  The handler has been updated to check for the download parameter early in the request cycle. If detected, the request is redirected to the dedicated GetSourceDownload function, ensuring that only the raw file is sent back to the client.

TODO:

• Add tests

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 34.72222% with 47 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/gnoweb/handler.go	33.89%	37 Missing and 2 partials ⚠️
gno.land/pkg/gnoweb/webclient_html.go	27.27%	6 Missing and 2 partials ⚠️

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