feat(doc): changelog system (#6350)

This system provides rules and automatizes (Deno-typescript) the creation of a changelog file to help developers to adapt their code and know what is new with every (pre)release

doc/changelog/pendings/changes_1623667140221711000.md

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+### Added
+- Created new changelog system.
+
+### How to upgrade
+
+To create a new changelog please follow the instructions on our [wiki page](https://www.azerothcore.org/wiki/how-to-use-changelog)

doc/changelog/pendings/create.sh

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+#!/usr/bin/env bash
+
+unamestr=$(uname)
+echo "OS: $unamestr"
+if [[ "$unamestr" == 'Darwin' ]]; then
+   rev=$(gdate +%s%N );
+else
+   rev=$(date +%s%N );
+fi
+
+CUR_PATH="$( cd "$( dirname "${BASH_SOURCE[0]}" )/" && pwd )";
+
+filename=changes_"$rev".md
+
+echo "Insert your changelog here
+
+### How to upgrade
+
+Add instructions on how to adapt the code to the new changes
+
+" > "$CUR_PATH/$filename" && echo "File created: $filename";