[Feature Request]: Support left-aligned forest plot placement in `g_forest()`

Feature description

Currently, g_forest() places the forest plot on the right-hand side of the table.

However, some TLG mock shells require the forest plot to be positioned immediately after the row labels (i.e., on the left side of the table), as shown in the screenshot below.

Would it be possible to add an option to g_forest() that allows the forest plot to be placed on either the left or the right side of the table?

Prerequisites

{tern} issue #1500 must be resolved before proceeding.

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