feat(pinia-orm): add mutators

[CodeDredd]

Thoughts

Mutators are coming back. In a better way.
There will be now also the possibilty to have a set mutator. The one big differnce is that you still can't put mutators in the field configuration.

Add wish vuex-orm/vuex-orm-next#114 and fix issue vuex-orm/vuex-orm#524, issue vuex-orm/vuex-orm#744

Checklist

• Docs
• Tests
• Decorator
• Decorator Tests
• Working setter & getter

Examples

Getter & Setter

    class User extends Model {
      static entity = 'users'

      @Attr(0) id!: number
      @Attr('') name!: string

      static mutators() {
        return {
          name: {
            get: (value: any) => value.toUpperCase(),
            set: (value: any) => value.toLowerCase(),
          },
        }
      }

Function get

    class User extends Model {
      static entity = 'users'

      @Attr('') name!: string

      static mutators() {
        return {
          name(value: any) {
            return value.toUpperCase()
          },
        }
      }
    }

Decorator

    class User extends Model {
      static entity = 'users'

      @Mutate((value: any) => value.toUpperCase())
      @Attr('')
        name!: string
    }

Feedback welcome

[codecov-commenter]

Codecov Report

Merging #84 (18e03fe) into master (52175e2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 18e03fe differs from pull request most recent head da5c41c. Consider uploading reports for the commit da5c41c to get more accurate results

@@           Coverage Diff           @@
##           master      #84   +/-   ##
=======================================
  Coverage   99.58%   99.59%           
=======================================
  Files          50       51    +1     
  Lines        4112     4186   +74     
  Branches      308      317    +9     
=======================================
+ Hits         4095     4169   +74     
  Misses         17       17           

Impacted Files	Coverage Δ
packages/pinia-orm/src/model/Model.ts	100.00% <100.00%> (ø)
packages/pinia-orm/src/model/decorators/Mutate.ts	100.00% <100.00%> (ø)
packages/pinia-orm/src/query/Query.ts	100.00% <100.00%> (ø)

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