Is your feature request related to a problem? Please describe.

An update stream has the following tags which are respected by the Joomla updater:

<supported_databases mysql="5.6" mariadb="10.1" postgresql="11.0" />
<php_minimum>7.2.5</php_minimum>
<targetplatform name="joomla" version="3.[789]" min_dev_level="0" max_dev_level="1" />

These options do not exist in extension manifests and are not recognised by the Joomla installer.

Describe the solution you'd like

I would like to see these control flags to be implemented into the Joomla installer. It makes sense to have them respected in both.

Currently an update cannot be installed if Joomla does not match it's minimum requirements but i can manully install an extension that could potentially break my site with not checks.

Additional context

I can understand if this is just implemented in Joomla 4.

in the above cell targetplatform the key name="joomla" I would also like to have this kept in so I can use this manifest spec for all of my none Joomla software. It also can be used as another check for valid Joomla software.