Breaks Support for Import Maps

[guybedford]

Intended outcome:
It should be possible to use apollo client devtools on websites that use import maps.

Actual outcome:
Because Apollo Client Devtools injects ES modules into the page, this causes all subsequent import maps in the page to not be processed, giving the import map error - An import map is added after module script load was triggered.

I've posted more information about this in WICG/import-maps#248.

How to reproduce the issue:
For example, try navigating to https://generator.jspm.io/ with the extension enabled in latest chrome with import maps support (89+). The error above comes up and the page will not load further unless the extension is disabled.

Desktop (please complete the following information):

• Browser: Chrome
• Browser version: 89
• Extension version: 3.02

[hwillson]

Interesting - thanks @guybedford. We'll take a look!