452 loading bar when loading data

[juanultimate]

• It adds a loading bar when the tables' information is being queried from the backend.
• Extracting time-entries array and IsLoading flag to a DataSource type.
• Fixing some typos
• Removing dead code
  

[codecov]

Codecov Report

Merging #477 into master will decrease coverage by 0.89%.
The diff coverage is 64.28%.

@@            Coverage Diff             @@
##           master     #477      +/-   ##
==========================================
- Coverage   89.50%   88.61%   -0.90%     
==========================================
  Files          72       73       +1     
  Lines        1324     1317       -7     
  Branches       93       92       -1     
==========================================
- Hits         1185     1167      -18     
- Misses        109      114       +5     
- Partials       30       36       +6     

Impacted Files	Coverage Δ
...ponents/details-fields/details-fields.component.ts	82.08% <ø> (-4.48%)	⬇️
.../components/technologies/technologies.component.ts	84.84% <ø> (ø)
...p/modules/time-clock/pages/time-clock.component.ts	91.66% <ø> (ø)
src/app/modules/time-clock/store/entry.actions.ts	100.00% <ø> (ø)
...rc/app/modules/time-clock/store/entry.selectors.ts	25.00% <14.28%> (-67.31%)	⬇️
...time-entries-table/time-entries-table.component.ts	57.89% <33.33%> (-4.02%)	⬇️
...nts/projects/components/store/project.selectors.ts	60.00% <50.00%> (-25.72%)	⬇️
...-management/store/customer-management.selectors.ts	73.68% <50.00%> (-2.79%)	⬇️
...-management/store/activity-management.selectors.ts	87.50% <75.00%> (-1.39%)	⬇️
src/app/modules/time-clock/store/entry.reducer.ts	97.61% <75.00%> (ø)
... and 13 more

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