feat(models): add models methods signatures

src/domain/model/principal.model.ts

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+import { Injectable } from '@nestjs/common';
+import { Principal } from '../entities/principal.entity';
+import { Role } from '../entities/role.entity';
+
+@Injectable()
+export class PrincipalModel {
+  principalsDb: Record<string, Principal>;
+  constructor() {}
+
+  create(roles: Role[]) {}
+  findById(id: string) {}
+  assignRoles(id: string, roles: Role[]) {}
+}

src/domain/model/role.model.ts

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+import { Injectable } from '@nestjs/common';
+import { Role } from '../entities/role.entity';
+import { Scope } from '../entities/scope.entity';
+
+@Injectable()
+export class RoleModel {
+  rolesDb: Record<string, Role>;
+  constructor() {}
+
+  create(scopes: Scope[]) {}
+  findById(id: string) {}
+  update(id: string, roles: Role[]) {}
+}

src/domain/model/scope.model.ts

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+import { Injectable } from '@nestjs/common';
+import { Scope } from '../entities/scope.entity';
+
+@Injectable()
+export class RoleModel {
+  scopesDb: Record<string, Scope>;
+  constructor() {}
+
+  create(urn: string, context: string) {}
+  findById(id: string) {}
+  update(id: string, urn: string, context: string) {}
+}