Added run_id as a keyword and support for out of the box functions.

[praveenkumar-aa]

Now the plugin recognizes "run_id" as a keyword and also helps in auto completion of the cslang out of the box functions which are listed below.

'cs_append'

'cs_extract_number'

'cs_substring'

'cs_to_lower'

'cs_to_upper'

'cs_prepend'

'cs_regex'

'cs_replace'

'cs_round'

'cs_xpath_query'

'cs_json_query'