Show version on startup

[kubukoz]

Description of changes:

Adds feature parity with the upstream by putting the server version into the version.properties resource in the Mill build. That way, it can be read at startup in the following part of the server init:

smithy-language-server/src/main/java/software/amazon/smithy/lsp/SmithyLanguageServer.java

Lines 143 to 147 in 1bac608

	try {
	props.load(SmithyLanguageServer.class.getClassLoader().getResourceAsStream("version.properties"));
	message = "Hello from smithy-language-server " + props.getProperty("version") + "!";
	} catch (Exception e) {
	LspLog.println("Could not read Language Server version: " + e);

Demo:

Screen.Recording.2023-05-10.at.02.15.00.mov

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.