feat(minato): support indexes

[Hieuzest]

Usage

database.extend('foo', {}, {
  indexes: [
    'name', 
    ['foo', 'bar'], 
    {
      name: 'x_asc',
      unique: false,
      keys: {
        x: 'asc',
      },
    },
  ],
})

Driver Index APIs (internal):

getIndexes(table: string): Promise<Driver.Index[]>
createIndex(table: string, index: Driver.Index): Promise<void>
dropIndex(table: string, name: string): Promise<void>

packed:

fix(mongo): initialization of virtual when switching optimizeIndex
feat(relation): support relation in unique definition in model.extend
chore(core): more accurate type for database.create
fix(mysql,postgres): migrate string field with default empty string

[codecov]

Codecov Report

Attention: Patch coverage is 98.39080% with 7 lines in your changes missing coverage. Please review.

Project coverage is 99.01%. Comparing base (04b03c0) to head (03b6b3b).

Files	Patch %	Lines
packages/memory/src/index.ts	82.35%	3 Missing ⚠️
packages/postgres/src/index.ts	95.74%	2 Missing ⚠️
packages/sqlite/src/index.ts	95.65%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
+ Coverage   98.97%   99.01%   +0.03%     
==========================================
  Files          39       39              
  Lines       12967    13372     +405     
  Branches     3214     3295      +81     
==========================================
+ Hits        12834    13240     +406     
+ Misses        133      132       -1     

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