feat: add user_secrets table (#19162)

Closes https://github.com/coder/internal/issues/780

## Summary of changes:
- added `user_secrets` table
- `user_secrets` table contains `env_name` and `file_path` fields which
are not used at the moment, but will be used in later PRs
- `user_secrets` table doesn't contain `value_key_id`, I will add it in
a separate migration in a dbcrypt PR
- on one hand I don't want to add fields which are not used (because
it's a risk smth may change in implementation later), on the other hand
I don't want to add too many migrations for user secrets table
- added unique sql indexes
- added sql queries for CRUD operations on user-secrets
- introduced new `ResourceUserSecret` resource
- basic unit-tests for CRUD ops and authorization behavior
- Role updates:
  - owner:
    - remove `ResourceUserSecret` from site-wide perms
    - add `ResourceUserSecret` to user-wide perms
   - orgAdmin
- remove `ResourceUserSecret` from org-wide perms; seems it's not
strictly required, because `ResourceUserSecret` is not tied to
organization in dbauthz wrappers?
   - memberRole
- no need to change memberRole because it implicitly has access to
user-secrets thanks to the `allPermsExcept`
   - is it enough changes to roles?
   
Main questions:
- [ ] We will have 2 migrations for user-secrets:
  - initial migration (in current PR)
  - adding `value_key_id` in dbcrypt PR
  - is this approach reasonable?
- [ ] Are changes to roles's permissions are correct?
- [ ] Are changes in roles_test.go are correct?

---------

Co-authored-by: Steven Masley <Emyrk@users.noreply.github.com>

coderd/database/models.go

@@ -3812,6 +3812,18 @@ type UserLink struct {
 	Claims UserLinkClaims `db:"claims" json:"claims"`
 }
 
+type UserSecret struct {
+	ID          uuid.UUID `db:"id" json:"id"`
+	UserID      uuid.UUID `db:"user_id" json:"user_id"`
+	Name        string    `db:"name" json:"name"`
+	Description string    `db:"description" json:"description"`
+	Value       string    `db:"value" json:"value"`
+	EnvName     string    `db:"env_name" json:"env_name"`
+	FilePath    string    `db:"file_path" json:"file_path"`
+	CreatedAt   time.Time `db:"created_at" json:"created_at"`
+	UpdatedAt   time.Time `db:"updated_at" json:"updated_at"`
+}
+
 // Tracks the history of user status changes
 type UserStatusChange struct {
 	ID        uuid.UUID  `db:"id" json:"id"`