Please include license text into the release jars, and add Bundle-License to MANIFEST.MF

[vlsi]

Currently, the release jar does not mention the license name and license text, so it complicates automatic license audit.

Suggested steps

1. Include the license text into the jars under META-INF/LICENSE
2. Add Bundle-License: MIT-0 manifest entry (where MIT-0 is SPDX identifier, see https://osgi.org/specification/osgi.core/7.0.0/framework.module.html#framework.module-bundle-license )

Of course, MIT-0 does not require reproducing license text in the release artifacts, however, including the text would help those who run into individual reactive-streams-...jar file

Context: apache/jmeter#5861