Activated the Usage func in the flag package on the tree

[andreimerlescu]

This PR activates the Usage function in the flag package by updating its signature and implementation across several files. Key changes include:

Changing the Usage method on figTree from returning a string to printing directly.
Updating the Core interface in types.go to match the new Usage signature.
Removing t.Log calls from tests to accommodate the new behavior of Usage, and updating the VERSION file.

[Copilot]

Pull Request Overview

This PR activates the Usage function in the flag package by updating its signature and implementation across several files. Key changes include:

• Changing the Usage method on figTree from returning a string to printing directly.
• Updating the Core interface in types.go to match the new Usage signature.
• Removing t.Log calls from tests to accommodate the new behavior of Usage, and updating the VERSION file.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
usage.go	Changed Usage signature and implementation to print output directly
types.go	Updated the Usage method signature in the Core interface
figtree.go	Assigned the updated Usage function to the flag set
alias_test.go	Removed t.Log calls for Usage reflecting the new behavior
VERSION	Bumped version from v2.0.9 to v2.0.10

Comments suppressed due to low confidence (1)

alias_test.go:18

• Since Usage now prints directly to standard output, consider capturing stdout in tests if verifying the help output is important.

t.Log(figs.Usage())