Enable TypeScript declaration maps
Enable TypeScript declaration maps

This allows go-to-definition to reach the original .ts files for
consumers of the package. It emits .d.ts.map files alongside the regular
.d.ts files

e.g. in sdk.createClient go-to-definition on createClient will place the
cursor at the function in src/matrix.ts rather than inside a definition
file lib/matrix.d.ts

Signed-off-by: Alex Macleod <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@macleod.io>

matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk