Feature/enforce license notice in each file via eslint rule (#304)

* [ESLint] Add "eslint-plugin-header" as dev dependency

* [ESLint::eslint-plugin-header] Setup rule

* [ESLint::eslint-plugin-header] Fix errors

src/components/source/GridLayouts.tsx

@@ -3,7 +3,8 @@
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
 
 import { IconButton, Menu, MenuItem, FormControlLabel, Radio } from '@mui/material';
 import React from 'react';

src/components/source/filters/CheckBoxFilter.tsx

@@ -5,6 +5,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
+
 import CheckboxInput from 'components/atoms/CheckboxInput';
 import React from 'react';
 

src/components/source/filters/GroupFilter.tsx

@@ -5,6 +5,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
+
 import { ExpandLess, ExpandMore } from '@mui/icons-material';
 import { Collapse, ListItemButton, ListItemText, Stack } from '@mui/material';
 import { Box } from '@mui/system';

src/components/source/filters/SeparatorFilter.tsx

@@ -5,6 +5,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
+
 import { Divider } from '@mui/material';
 import React from 'react';
 

src/components/source/filters/SortFilter.tsx

@@ -5,6 +5,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
+
 import { ExpandLess, ExpandMore } from '@mui/icons-material';
 import { Collapse, ListItemButton, ListItemText, Stack } from '@mui/material';
 import { Box } from '@mui/system';

src/components/source/filters/TextFilter.tsx

@@ -5,6 +5,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
+
 import SearchIcon from '@mui/icons-material/Search';
 import { FormControl, Input, InputAdornment, InputLabel } from '@mui/material';
 import React from 'react';

src/components/source/filters/TriStateFilter.tsx

@@ -5,6 +5,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
+
 import ThreeStateCheckboxInput from 'components/atoms/ThreeStateCheckboxInput';
 import React from 'react';