[FIX] Node.js API: TypeScript type definition support

[matz3]

Lazy-loading breaks the automatic type definition detection from

TypeScript. Therefore we need to manually declare the exported types.

[coveralls]

Coverage decreased (-0.4%) to 92.873% when pulling ebecd42 on fix-ts-support into 6f73557 on master.

[RandomByte]

CI is not happy:

ERROR: Unable to parse a tag's type expression for source file /home/vsts/work/1/s/index.js in line 6 with tag title "type" and text "{import('./lib/server')}": Invalid type expression "import('./lib/server')": Expected "!", "=", "?", "[]", "|", or end of input but "(" found.
ERROR: Unable to parse a tag's type expression for source file /home/vsts/work/1/s/index.js in line 9 with tag title "type" and text "{import('./lib/server')}": Invalid type expression "import('./lib/server')": Expected "!", "=", "?", "[]", "|", or end of input but "(" found.
ERROR: Unable to parse a tag's type expression for source file /home/vsts/work/1/s/index.js in line 10 with tag title "type" and text "{import('./lib/sslUtil')}": Invalid type expression "import('./lib/sslUtil')": Expected "!", "=", "?", "[]", "|", or end of input but "(" found.
ERROR: Unable to parse a tag's type expression for source file /home/vsts/work/1/s/index.js in line 13 with tag title "type" and text "{import('./lib/sslUtil')}": Invalid type expression "import('./lib/sslUtil')": Expected "!", "=", "?", "[]", "|", or end of input but "(" found.
ERROR: Unable to parse a tag's type expression for source file /home/vsts/work/1/s/index.js in line 14 with tag title "type" and text "{import('./lib/middleware/middlewareRepository')}": Invalid type expression "import('./lib/middleware/middlewareRepository')": Expected "!", "=", "?", "[]", "|", or end of input but "(" found.
ERROR: Unable to parse a tag's type expression for source file /home/vsts/work/1/s/index.js in line 17 with tag title "type" and text "{import('./lib/middleware/middlewareRepository')}": Invalid type expression "import('./lib/middleware/middlewareRepository')": Expected "!", "=", "?", "[]", "|", or end of input but "(" found.

[matz3]

The jsdoc-plugin.js from SAP/ui5-fs#252 is missing here

[RandomByte]

Maybe a more precise commit message would be good if possible