Add storing of vertical alignment property for column blocks

[MAILPOET-2609]

tests/javascript/form_editor/store/block_to_form_test_data.js

@@ -174,6 +174,7 @@ export const nestedColumns = {
       isValid: true,
       attributes: {
         width: 66.66,
+        verticalAlignment: 'center',
       },
       innerBlocks: [
         {

tests/javascript/form_editor/store/blocks_to_form_body.spec.js

@@ -314,6 +314,7 @@ describe('Blocks to Form Body', () => {
     const column2 = columns.body[1];
     expect(column1.type).to.be.equal('column');
     expect(column1.params.width).to.be.equal(66.66);
+    expect(column1.params.vertical_alignment).to.be.equal('center');
     expect(column1.body.length).to.be.equal(2);
     expect(column2.type).to.be.equal('column');
     expect(column2.body.length).to.be.equal(1);

tests/javascript/form_editor/store/form_body_to_blocks.spec.js

@@ -323,6 +323,8 @@ describe('Form Body To Blocks', () => {
     // First level
     const column1 = blocks[1].innerBlocks[0];
     expect(column1.name).to.be.equal('core/column');
+    expect(column1.attributes.width).to.be.equal(66.66);
+    expect(column1.attributes.verticalAlignment).to.be.equal('center');
     expect(column1.innerBlocks.length).to.be.equal(2);
     const columns11 = column1.innerBlocks[0];
     checkBlockBasics(column1.innerBlocks[1]);
@@ -330,7 +332,6 @@ describe('Form Body To Blocks', () => {
     expect(column2.name).to.be.equal('core/column');
     expect(column2.innerBlocks.length).to.be.equal(1);
     checkBlockBasics(column1.innerBlocks[0]);
-
     // Second level
     expect(columns11.innerBlocks.length).to.be.equal(2);
     const column11 = columns11.innerBlocks[0];

tests/javascript/form_editor/store/form_to_block_test_data.js

@@ -184,6 +184,7 @@ export const nestedColumns = {
       type: 'column',
       params: {
         width: 66.66,
+        vertical_alignment: 'center',
       },
       body: [
         {