add node types

[yesid-lopez]

El ci no está fallando debido a un problema al detectar algunos paquetes como inexistentes. Este es un ejemplo de uno de los builds: https://travis-ci.org/github/AgileTestingColombia/workshop-protractor/builds/711807475

El output del CI es algo como esto:

> tsc
node_modules/blocking-proxy/built/lib/blockingproxy.d.ts(1,23): error TS2688: Cannot find type definition file for 'node'.
node_modules/blocking-proxy/built/lib/blockingproxy.d.ts(2,23): error TS2307: Cannot find module 'http'.
node_modules/blocking-proxy/built/lib/webdriver_commands.d.ts(1,23): error TS2688: Cannot find type definition file for 'node'.
node_modules/blocking-proxy/built/lib/webdriver_commands.d.ts(5,25): error TS2307: Cannot find module 'events'.
node_modules/blocking-proxy/built/lib/webdriver_logger.d.ts(1,23): error TS2688: Cannot find type definition file for 'node'.
node_modules/blocking-proxy/built/lib/webdriver_logger.d.ts(2,25): error TS2307: Cannot find module 'stream'.
node_modules/blocking-proxy/built/lib/webdriver_proxy.d.ts(1,23): error TS2688: Cannot find type definition file for 'node'.
node_modules/blocking-proxy/built/lib/webdriver_proxy.d.ts(2,23): error TS2307: Cannot find module 'http'.
node_modules/protractor/built/runner.d.ts(1,23): error TS2688: Cannot find type definition file for 'node'.
node_modules/protractor/built/runner.d.ts(3,30): error TS2307: Cannot find module 'events'.
protractor/helpers/reporter.ts(2,27): error TS2580: Cannot find name 'require'. Do you need to install type definitions for node? Try `npm i @types/node`.
protractor/saucelabs.config.ts(36,14): error TS2580: Cannot find name 'process'. Do you need to install type definitions for node? Try `npm i @types/node`.
protractor/saucelabs.config.ts(37,13): error TS2580: Cannot find name 'process'. Do you need to install type definitions for node? Try `npm i @types/node`.
protractor/zalenium.config.ts(36,14): error TS2580: Cannot find name 'process'. Do you need to install type definitions for node? Try `npm i @types/node`.
protractor/zalenium.config.ts(37,13): error TS2580: Cannot find name 'process'. Do you need to install type definitions for node? Try `npm i @types/node`.
src/page/personal-information.page.ts(2,25): error TS2307: Cannot find module 'path'.
src/page/personal-information.page.ts(3,28): error TS2307: Cannot find module 'fs'.
src/page/personal-information.page.ts(78,30): error TS2580: Cannot find name 'process'. Do you need to install type definitions for node? Try `npm i @types/node`.
src/service/download.service.ts(1,68): error TS2307: Cannot find module 'fs'.
src/service/download.service.ts(2,25): error TS2307: Cannot find module 'path'.
src/service/download.service.ts(9,31): error TS2580: Cannot find name 'process'. Do you need to install type definitions for node? Try `npm i @types/node`.
src/service/download.service.ts(21,46): error TS2580: Cannot find name 'Buffer'. Do you need to install type definitions for node? Try `npm i @types/node`.
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! psl-workshop-protractor@1.0.0 build: `tsc`
npm ERR! Exit status 2
npm ERR! 
npm ERR! Failed at the psl-workshop-protractor@1.0.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/travis/.npm/_logs/2020-07-25T21_07_58_687Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! psl-workshop-protractor@1.0.0 test:saucelabs: `npm run build && protractor dist/protractor/saucelabs.config.js`
npm ERR! Exit status 2
npm ERR! 
npm ERR! Failed at the psl-workshop-protractor@1.0.0 test:saucelabs script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/travis/.npm/_logs/2020-07-25T21_07_58_717Z-debug.log
npm ERR! Test failed.  See above for more details.
The command "npm test" exited with 1.