feat: Add optimistic update for block placement

The code changes in `place_block.js` introduce an optimistic update feature for block placement. This feature sets the default state of the block being placed based on the held item. It retrieves the default state from the `minecraft-data` module and updates the block state at the destination accordingly. This optimistic update improves the responsiveness of block placement.

Note: This suggested commit message follows the convention of using a prefix to indicate the type of change (`feat` for a new feature).

lib/plugins/place_block.js

@@ -8,6 +8,14 @@ function inject (bot) {
     let oldBlock = bot.blockAt(dest)
     await bot._genericPlace(referenceBlock, faceVector, options)
 
+    // optimistic update
+    const heldItem = bot.heldItem
+    const mcData = require('minecraft-data')(bot.version)
+    const defaultState = mcData.blocksByName[heldItem?.name]?.defaultState
+    if (defaultState) {
+      bot.world.setBlockStateId(dest, defaultState)
+    }
+
     let newBlock = bot.blockAt(dest)
     if (oldBlock.type === newBlock.type) {
       [oldBlock, newBlock] = await onceWithCleanup(bot, `blockUpdate:${dest}`, {