Adding in patchwork:free functionality

[ShreyaSreeram27]

What changes are proposed in this pull request?

• Adding in patchwork:free() to better align risktables with plots, especially when x-axes labels are very long.

If there is an GitHub issue associated with this pull request, please provide link.
Closes #230

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Reviewer Checklist (if item does not apply, mark as complete)

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When the branch is ready to be merged into master:

• Update NEWS.md with the changes from this pull request under the heading "# ggsurvfit (development version)". If there is an issue associated with the pull request, reference it in parentheses at the end update (see NEWS.md for examples).
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[ShreyaSreeram27]

• ggsurvfit_align_plots: looks at the area left of the primary plot; then right of the plot
• then measures after making grobs
• goes to risktable plot , then requires both to be the same length
• if we require that the right hand sides of both are exact same length; then use patchwork::free to align the left hand sides of the plot and risktable