feat: Implement StandardSchemaV1 spec

[jycouet]

Proposal

// Usual entity stuff
@Entity('User')
class User {
  @Fields.id()
  id!: string
  @Fields.string({ required: true })
  name!: string
  @Fields.number()
  age?: number
}

// Schema Part 🎉 new stuff 🎉
import { std } from 'remult'

const schema1 = standardSchema(repo(User))
//     ^ this is a standard-schema for all User

const schema2 = standardSchema(repo(User), 'name', 'age')
//     ^ this is a standard-schema looking for name and age (name & age are typed!)

Open questions

• std(User, 'name', 'age') vs std(User, ['name', 'age']) update in the code example
• std vs Schema.standardSchemaV1 vs INSERT_A_COOL_NAME_HERE update in the code example

Checklist

• export in public api
• CHANGELOG.md updated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.78%. Comparing base (fa4a6de) to head (1f4a672).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #777      +/-   ##
==========================================
+ Coverage   86.73%   86.78%   +0.05%     
==========================================
  Files         103      105       +2     
  Lines       16459    16502      +43     
  Branches     3853     3868      +15     
==========================================
+ Hits        14275    14322      +47     
+ Misses       2184     2180       -4     

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