feat(mvn): Add maven segment

[felipebz]

Prerequisites

• I have read and understood the contributing guide.
• The commit message follows the conventional commits guidelines.
• Tests for the changes have been added (for bug fixes / features).
• Docs have been added/updated (for bug fixes / features).

Description

Hi,

This PR adds the "mvn" segment to display the current Maven version. When the project includes a Maven wrapper, this segment uses the mvnw command to determine the active Maven version.

This change resolves #5299.

[JanDeDobbeleer]

@all-contributors please add @felipebz for code,design,doc

This is pure magic 🪄! @holopin-bot @felipebz wizard

[holopin-bot]

Congratulations @felipebz, the maintainer of this repository has issued you a badge! Here it is: https://holopin.io/claim/clz1fnllz16000cl3zc2hzxlp

This badge can only be claimed by you, so make sure that your GitHub account is linked to your Holopin account. You can manage those preferences here: https://holopin.io/account.
Or if you're new to Holopin, you can simply sign up with GitHub, which will do the trick!

[allcontributors]

@JanDeDobbeleer

I've put up a pull request to add @felipebz! 🎉