Improvement: Render branch names on the other side in GitGraphs

[pberndt]

Description

In Git graphs the branch names are currently rendered on the left in left-to-right diagrams and top in top-to-bottom diagrams etc., that is, on the side of the oldest commit.
This is a bit awkward since git branches are actually pointers to single commits, specifically, the last commit of the series of commits that are informally considered "part of that branch".

Steps to reproduce

1. Create any Git graph diagram
2. The branch label(s) will be rendered on the side that is farthest away from the commit that the git branch actually points to

Screenshots

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Code Sample

Setup

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Suggested Solutions

Therefore I propose to

1. Add the option to render the branch labels on the other side
2. Make what is currently the "other side" (i.e. last commit side) the new default (optional)

Additional Context

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