Version embedding and display

## Background
Application version is incorporated and read via a configuration file (`application.conf` and `application.properties`).
That can be theoretically overridden by user or configuration. Also it's not really output in any way except UI.

## Goal
Make the version number more "hardcoded", read within the application in a standard way and make it available to the user

## Expected Task List
1. Application version from `pom.xml` is embedded within the code.
2. There's a standard way how to read that version.
3. Display the version in UI
4. Display the version when `SparkJobs.jar` is called with `--help` parameter
5. Create a Menas API returning the version

**NB! Don't forget to assign the Epic into a Milestone**

Start by reading pom.xml and tracing how the version is currently supplied through application.conf and application.properties. Check the SparkJobs.jar --help entry point, the UI, and the Menas API; done means one embedded version is read consistently and exposed in all three user-facing locations.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.