Add CodeQL version to github/codeql-action/init outputs

[mschwager]

Hi there,

I'm working on caching some query compilations and it'd be helpful to receive the CodeQL version as output from the github/codeql-action/init action. This could be done similar to the codeql-path output. It appears that this would require minimal changes in the following locations:

codeql-action/src/init-action.ts

Line 557 in b611370

core.setOutput("codeql-path", config.codeQLCmd);

Add something like core.setOutput("codeql-version", await codeql.getVersion()).version).

And:

codeql-action/init/action.yml

Lines 139 to 141 in b611370

	outputs:
	codeql-path:
	description: The path of the CodeQL binary used for analysis

Add something like:

   codeql-version: 
     description: The version of the CodeQL binary used for analysis 

[ginsbach]

Thank you for submitting this issue with the linked PR to fix it!
As the PR is approved, feel free to merge it after resolving the remaining merge conflict.