feat: add BeforeFind hook

[MhmdGol]

• Do only one thing
• Non breaking API changes
• Tested

What did this pull request do?

Added BeforeFind hook capability to the queries. Closes #7357

User Case Description

From now on Find, First, Take and so on can have before hook.
It will be executed before executing query itself.

type Product struct {
    Code string
    Price float64
}

func (s *Product) BeforeFind() error {
    // do something before query
}

[MhmdGol]

@a631807682 and @daheige
Can you please review?

[mrubiottec]

Looking forward to getting this added in GORM. Is there an update on this?

[jinzhu]

We won’t be accepting this proposal, as it could lead to some misuse.

Thank you for your PR.