Create V3.0.0 for M9

[badetitou]

It appears in #60 that we will break backward compatibility in future development.
To avoid any problem with the former version of Moose. These are the steps we have to perform

• Creating a new branch named v2 that contains the code of PetitParser v2.x.x
• Change GitHub actions to execute only the tests for the P9.
• Merge the PR of Stephane with tests fixed for P9
• Change GitHub actions to execute the tests for the P6, 7, 8 in v2 branch.
• Add branch protection security to v2
• Release the code under version 3.0.0, 3.0.x, and 3.x.x
• Update the Readme with new instruction
• Update the Moose IDE PetitParser entry (in the menu) in M9 to point out v3.x.x

[badetitou]

• Change GitHub actions to execute only the tests for the P9, and
• Merge the PR of Stephane with tests fixed for P9

Are work in progress in #63

[badetitou]

Done