chore: witch to explicit type exports and enable verbatimModuleSyntax.

[GauthierPLM]

• Updated code to use explicit type exports, following TypeScript best practices and ensuring a type is never used as a value.
• Enabled verbatimModuleSyntax for better adherence to TypeScript module syntax standards. It will also cause a build error if a type is used as value (class, constant, ...).

Background

I encounter errors when enabling verbatimModuleSyntax on my NestJS app, with errors reported from nestjs-dataloader: TS will complain that types are exported as values:

../../node_modules/@strv/nestjs-dataloader/src/Dataloader.factory.ts:106:3 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

106   LoaderFrom,
      ~~~~~~~~~~
../../node_modules/@strv/nestjs-dataloader/src/Dataloader.factory.ts:107:3 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

107   Aggregated,
      ~~~~~~~~~~
../../node_modules/@strv/nestjs-dataloader/src/index.ts:1:10 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

1 export { LifetimeKeyFn, DataloaderOptions, DataloaderModuleOptions } from './types.js'
           ~~~~~~~~~~~~~
../../node_modules/@strv/nestjs-dataloader/src/index.ts:1:25 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

1 export { LifetimeKeyFn, DataloaderOptions, DataloaderModuleOptions } from './types.js'
                          ~~~~~~~~~~~~~~~~~
../../node_modules/@strv/nestjs-dataloader/src/index.ts:1:44 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

1 export { LifetimeKeyFn, DataloaderOptions, DataloaderModuleOptions } from './types.js'
                                             ~~~~~~~~~~~~~~~~~~~~~~~
../../node_modules/@strv/nestjs-dataloader/src/index.ts:4:29 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

4 export { DataloaderFactory, LoaderFrom, Aggregated } from './Dataloader.factory.js'
                              ~~~~~~~~~~
../../node_modules/@strv/nestjs-dataloader/src/index.ts:4:41 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

4 export { DataloaderFactory, LoaderFrom, Aggregated } from './Dataloader.factory.js'
                                          ~~~~~~~~~~
../../node_modules/@strv/nestjs-dataloader/src/types.ts:34:3 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

34   Factory,
     ~~~~~~~
../../node_modules/@strv/nestjs-dataloader/src/types.ts:35:3 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

35   LifetimeKeyFn,
     ~~~~~~~~~~~~~
../../node_modules/@strv/nestjs-dataloader/src/types.ts:36:3 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

36   DataloaderOptions,
     ~~~~~~~~~~~~~~~~~
../../node_modules/@strv/nestjs-dataloader/src/types.ts:37:3 - error TS1205: Re-exporting a type when 'verbatimModuleSyntax' is enabled requires using 'export type'.

37   DataloaderModuleOptions,