Create a single-page application for Query Viewer

[yhwang]

Description

Add another webpack config to generate a single-page application for the Query Viewer and related artifacts, including:

• a template file for the single-page application
• a bootstrap CSS using external links for the fonts

Motivation and Context

The Query Viewer page doesn't rely on any Presto server API and can be used independently. It would be good to
convert it into a single-page application and users can use it locally.

Impact

None. A new single-page HTML file is created and no change to existing pages/services.

Test Plan

Run the yarn command to generate the HTML file, open it, and load JSON file to check the query details.

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Release Notes

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== NO RELEASE NOTE ==

[yhwang]

Some explanations about the changes:

• templates/query_viewer.html: I modified the original query_viewer.html to use CDN links for the JS/CSS libraries we need. So I don't have to embed the JS/CSS files into the output HTML page which reduces the final file size.
• a new bootstrap.css: it comes from the existing bootstrap.css but uses external links for the fonts. Otherwise, I can't pack the font files into the HTML.
• new webpack config file: it is used to generate the single page file.

And I didn't include the final HTML file in this PR. Users need to run the yarn spa command to generate the file manually.

[yhwang]

cc @aaneja @majetideepak

[alonsovb]

code looks good!