Support declare in babel configuration for Typescript

[exalate-issue-sync]

When using declare (example patch), the optimizer will fail with:

node scripts/build_kibana_platform_plugins.js 
 info initialized, 0 bundles cached
 info starting worker [24 bundles]
 info starting worker [24 bundles]
 info starting worker [23 bundles]
 info starting worker [24 bundles]
 info starting worker [23 bundles]
 info starting worker [23 bundles]
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ERROR webpack compile errors
   │ERROR [dashboard] build
       │ERROR Optimizations failure.
       │         275 modules
       │          
       │          ERROR in ./public/application/embeddable/viewport/dashboard_viewport.tsx
       │          Module build failed (from /home/tyler/elastic/kibana/node_modules/babel-loader/lib/index.js):
       │          SyntaxError: /home/tyler/elastic/kibana/src/plugins/dashboard/public/application/embeddable/viewport/dashboard_viewport.tsx: TypeScript 'declare' fields must first be transformed by @babel/plugin-transform-typescript.
       │          If you have already enabled that plugin (or '@babel/preset-typescript'), make sure that it runs before any plugin related to additional class features:
       │           - @babel/plugin-proposal-class-properties
       │           - @babel/plugin-proposal-private-methods
       │           - @babel/plugin-proposal-decorators
       │            33 | export class DashboardViewport extends React.Component<DashboardViewportProps, State> {
       │            34 |   static contextType = context;
       │          > 35 |   public declare readonly context: DashboardReactContextValue;
       │               |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       │            36 |
       │            37 |   private controlsRoot: React.RefObject<HTMLDivElement>;
       │            38 |
       │              at File.buildCodeFrameError (/home/tyler/elastic/kibana/node_modules/@babel/core/lib/transformation/file/file.js:249:12)
       │              at NodePath.buildCodeFrameError (/home/tyler/elastic/kibana/node_modules/@babel/traverse/lib/path/index.js:139:21)
       │              at Object.assertFieldTransformed (/home/tyler/elastic/kibana/node_modules/@babel/plugin-proposal-class-properties/node_modules/@babel/helper-create-class-features-plugin/lib/typescript.js:10:16)
       │              at buildFieldsInitNodes (/home/tyler/elastic/kibana/node_modules/@babel/plugin-proposal-class-properties/node_modules/@babel/helper-create-class-features-plugin/lib/fields.js:788:34)
       │              at PluginPass.Class (/home/tyler/elastic/kibana/node_modules/@babel/plugin-proposal-class-properties/node_modules/@babel/helper-create-class-features-plugin/lib/index.js:181:48)
       │              at newFn (/home/tyler/elastic/kibana/node_modules/@babel/traverse/lib/visitors.js:177:21)
       │              at NodePath._call (/home/tyler/elastic/kibana/node_modules/@babel/traverse/lib/path/context.js:53:20)
       │              at NodePath.call (/home/tyler/elastic/kibana/node_modules/@babel/traverse/lib/path/context.js:40:17)
       │              at NodePath.visit (/home/tyler/elastic/kibana/node_modules/@babel/traverse/lib/path/context.js:90:31)
       │              at TraversalContext.visitQueue (/home/tyler/elastic/kibana/node_modules/@babel/traverse/lib/context.js:103:16)
       │           @ ./public/application/embeddable/dashboard_container.tsx 17:0-66 157:89-106
       │           @ ./public/application/embeddable/dashboard_container_factory.tsx
       │           @ ./public/application/embeddable/index.ts
       │           @ ./public/application/index.ts
       │           @ ./public/index.ts
       │           @ /home/tyler/elastic/kibana/node_modules/@kbn/optimizer/target_node/worker/entry_point_creator.js
ERROR webpack issue