chore: modify license structure to include apache2

[philknows]

Motivation

To clarify confusion about which parts of Lodestar are under which open source licenses. Github automatically detects what is under license but our repository has 2 difference licenses in place depending on the package.

Description

This PR makes it clear which packages of Lodestar are under which open-source license. This also fixes the automatic detection mechanism Github uses to display under "About" what licenses this repository has so it displays both Apache 2.0 and LGPL 3.0.

The following are licensed under LGPL 3.0:

• lodestar/packages/beacon-node
• lodestar/packages/cli
• lodestar/packages/validator

The following are licensed under Apache 2.0:

• lodestar/packages/api
• lodestar/packages/config
• lodestar/packages/db
• lodestar/packages/flare
• lodestar/packages/fork-choice
• lodestar/packages/light-client
• lodestar/packages/logger
• lodestar/packages/params
• lodestar/packages/reqresp
• lodestar/packages/spec-test-util
• lodestar/packages/state-transition
• lodestar/packages/test-utils
• lodestar/packages/types
• lodestar/packages/utils

[wemeetagain]

🎉 This PR is included in v1.20.0 🎉