Create descriptive labels for economic metrics

[andkov]

@izasimovych , please follow the pattern for populating vector metric_name_label on line 40 of ./manipulation/ellis-economics.R to create descriptive labels for economic measured of hromadas stored in
App 3. Показники фінансвої спроможності тергромад 1 кв 2022 (в ІАС)

Notes:

• Try to keep it as short as possible. Ideally we don't want to be longer that 50-70 characters. The shorter the better.
• Please use the main branch and the same file to contribute, but DO NOT commit any other lines outside of the specified in this issue.