feat(nextjs-component): add deploy input which can be set to false to skip deployment

[dphang]

Motivation

This adds support for a new input, deploy that allows users to skip the deployment step (creating AWS resources). All build outputs will be stored in .serverless_nextjs folder - default-lambda, api-lambda, and assets (in same structure as accessed by the handler in s3).

This will give more flexibility to users who may wish to deploy using their own scripts, other IaC (e.g Terraform), etc. User is responsible for uploading all files to S3 themselves (with correct headers), setting CF configuration, uploading Lambdas.

This will close: #642 and #419

Tests

Added a unit test.

[codecov]

Codecov Report

Merging #691 into master will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #691      +/-   ##
==========================================
+ Coverage   80.10%   80.13%   +0.03%     
==========================================
  Files          54       54              
  Lines        1714     1717       +3     
  Branches      357      358       +1     
==========================================
+ Hits         1373     1376       +3     
  Misses        283      283              
  Partials       58       58              

Impacted Files	Coverage Δ
...rless-components/nextjs-component/src/component.ts	89.92% <100.00%> (+0.22%)	⬆️

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