Support for custom resource APIs

[agubler]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:

Extends dojo resources to support defining and providing custom APIs in a resource template. With additional support for updating/creating data within a resource.

Creating a template with a custom API

const template = createResourceTemplate<Data, { save: (item: Data) => void }>({
    idKey: 'id',
    save: (item, controls) => {
        controls.push([item]);
    }
});

Create resource middleware that defines a custom API

const resource = createResourceMiddleware<Data, { save: (item: Data) => void }>()

[codesandbox-ci]

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Latest deployment of this branch, based on commit 8777307:

Sandbox	Source
dojo/dojo-codesandbox-template	Configuration

[codecov]

Codecov Report

Merging #878 (f50fff3) into master (820d3bc) will decrease coverage by 0.12%.
The diff coverage is 91.89%.

@@            Coverage Diff             @@
##           master     #878      +/-   ##
==========================================
- Coverage   94.58%   94.46%   -0.13%     
==========================================
  Files         127      127              
  Lines        7959     7999      +40     
  Branches     1859     1871      +12     
==========================================
+ Hits         7528     7556      +28     
- Misses        431      443      +12     

Impacted Files	Coverage Δ
src/testing/renderer.ts	97.32% <ø> (ø)
src/core/middleware/resources.ts	94.36% <91.89%> (-2.93%)	⬇️

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