Add events for plot buying

[PierreSchwang]

Overview

Required for IntellectualSites/HoloPlots#171

Usage (and my tests):

@Subscribe
    public void onPlayerBuyPlot(PlayerBuyPlotEvent event) {
        // Cancel / Disallow plot buy
        event.setEventResult(Result.DENY);
        
        // Modify price
        event.setPrice(event.price() * 1.337);
        
        // Ignore player balance and set price basically to 0
        event.setEventResult(Result.FORCE);
    }

    @Subscribe
    public void onPlayerBoughtPlot(PostPlayerBuyPlotEvent event) {
        event.getPlotPlayer().sendMessage(StaticCaption.of("Have fun with your plot by " + event.previousOwner().getName() + " " +
                "for which you paid " + event.price()));
    }

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1. Make sure you are opening from a topic branch (**/feature/fix/docs/ branch** (right side)) and not your main branch.

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[NotMyFault]

Optionally, would you mind adding todo annotations to the interface methods added?

[PierreSchwang]

Optionally, would you mind adding todo annotations to the interface methods added?

The interface itself shouldn't have any method changes, just the one deprecation and annotations

[NotMyFault]

Do you want to file the HoloPlots PR? @PierreSchwang

[PierreSchwang]

Do you want to file the HoloPlots PR? @PierreSchwang

Possibly adding that to the existing PR if not merged until then. But that's the plan, yeah