CodeChecker cmd runs - should provide analysis information (list of enabled checkers)

[dkrupp]

'CodeChecker cmd runs --enabled-checkers' should list all checkers which were enabled in at least one of the selected runs.

for example

CodeChecker cmd runs -n master --enabled-checkers -o plaintext shoudl list the enabeld checkers for the run named "master".

Enabled Checkers:
alpha.core.CastToStruct
alpha.core.Conversion
bugprone-macro-parentheses

The json, plaintext, rows,csv, table output formats should besupported