Add version number to abp.js

[m-aliozkaya]

https://www.wappalyzer.com/ https://github.com/wappalyzer/wappalyzer/blob/a1e310c2daa5ec7425febf13c69afb4706f4e55c/CONTRIBUTING.md

Wappalyzer helps us to detect which technologies a website was built using. I want to add ABP Framework detection to Wapplyzer. If you add following script to your abp.js file, Wappalyzer can detect ABP Framework version of websites.

abp.version = '5.3.0'