feat: add config option persistOptions to handle relation data

[cuebit]

Resolves #120

Type of PR:

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Documentation
• Other, please describe:

Breaking changes:

• No
• Yes

Details

This PR adds a new configuration option persistOptions to constrain relation persistence. It's a by-product of #119 and works seamlessly with, but not limited to, the persistBy option.

The option simply attaches the existing Vuex ORM persist options:

User.api().get('/api/users', {
  persistOptions: {
    insert: ['posts']
  }
})

And compliments the persistBy option when used in combination:

User.api().get('/api/users', {
  persistBy: 'create',
  persistOptions: {
    insert: ['posts'],
    insertOrUpdate: ['roles']
  }
})

See also: Vuex ORM – Insert Method for Relationships

[codecov]

Codecov Report

Merging #121 into dev will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               dev      #121   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines           91        92    +1     
  Branches        13        14    +1     
=========================================
+ Hits            91        92    +1     

Impacted Files	Coverage Δ
src/api/Request.ts	100.00% <ø> (ø)
src/api/Response.ts	100.00% <100.00%> (ø)

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