chore: import webpack using "* as webpack" syntax (#780)

Avoids problems like the following:

```
$ npx tsc
node_modules/fork-ts-checker-webpack-plugin/lib/plugin.d.ts:1:13 - error TS1259: Module '".../node_modules/webpack/types"' can only be default-imported using the 'allowSyntheticDefaultImports' flag

1 import type webpack from 'webpack';
              ~~~~~~~

  node_modules/webpack/types.d.ts:13189:1
    13189 export = exports;
          ~~~~~~~~~~~~~~~~~
    This module is declared with 'export =', and can only be used with a default import when using the 'allowSyntheticDefaultImports' flag.

Found 1 error in node_modules/fork-ts-checker-webpack-plugin/lib/plugin.d.ts:1
```

Author: lrworth

src/hooks/intercept-done-to-get-dev-server-tap.ts

@@ -1,4 +1,4 @@
-import type webpack from 'webpack';
+import type * as webpack from 'webpack';
 
 import { getInfrastructureLogger } from '../infrastructure-logger';
 import type { ForkTsCheckerWebpackPluginConfig } from '../plugin-config';

src/hooks/tap-after-compile-to-add-dependencies.ts

@@ -1,4 +1,4 @@
-import type webpack from 'webpack';
+import type * as webpack from 'webpack';
 
 import { getInfrastructureLogger } from '../infrastructure-logger';
 import type { ForkTsCheckerWebpackPluginConfig } from '../plugin-config';

src/hooks/tap-after-compile-to-get-issues.ts

@@ -1,4 +1,4 @@
-import type webpack from 'webpack';
+import type * as webpack from 'webpack';
 
 import { getInfrastructureLogger } from '../infrastructure-logger';
 import type { Issue } from '../issue';

src/hooks/tap-after-environment-to-patch-watching.ts

@@ -1,4 +1,4 @@
-import type webpack from 'webpack';
+import type * as webpack from 'webpack';
 
 import { getInfrastructureLogger } from '../infrastructure-logger';
 import type { ForkTsCheckerWebpackPluginState } from '../plugin-state';

src/hooks/tap-done-to-async-get-issues.ts

@@ -1,5 +1,5 @@
 import chalk from 'chalk';
-import type webpack from 'webpack';
+import type * as webpack from 'webpack';
 
 import { statsFormatter } from '../formatter/stats-formatter';
 import { createWebpackFormatter } from '../formatter/webpack-formatter';

src/hooks/tap-error-to-log-message.ts

@@ -1,5 +1,5 @@
 import chalk from 'chalk';
-import type webpack from 'webpack';
+import type * as webpack from 'webpack';
 
 import type { ForkTsCheckerWebpackPluginConfig } from '../plugin-config';
 import { getPluginHooks } from '../plugin-hooks';

src/hooks/tap-stop-to-terminate-workers.ts

@@ -1,4 +1,4 @@
-import type webpack from 'webpack';
+import type * as webpack from 'webpack';
 
 import { getInfrastructureLogger } from '../infrastructure-logger';
 import type { ForkTsCheckerWebpackPluginState } from '../plugin-state';

src/infrastructure-logger.ts

@@ -1,4 +1,4 @@
-import type webpack from 'webpack';
+import type * as webpack from 'webpack';
 
 export interface InfrastructureLogger {
   log(...args: unknown[]): void;

src/issue/issue-config.ts

@@ -1,4 +1,4 @@
-import type webpack from 'webpack';
+import type * as webpack from 'webpack';
 
 import { createIssuePredicateFromIssueMatch } from './issue-match';
 import type { IssuePredicateOption, IssueOptions } from './issue-options';

src/issue/issue-webpack-error.ts

@@ -1,7 +1,7 @@
 import path from 'path';
 
 import chalk from 'chalk';
-import webpack from 'webpack';
+import * as webpack from 'webpack';
 
 import type { FormatterPathType } from '../formatter';
 import { forwardSlash } from '../utils/path/forward-slash';