add: full multi-tenancy control

packages/Webkul/Core/src/Contracts/CoreConfig.php

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+<?php
+
+namespace Webkul\Core\Contracts;
+
+interface CoreConfig {}

packages/Webkul/Core/src/Contracts/Country.php

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+<?php
+
+namespace Webkul\Core\Contracts;
+
+interface Country {}

packages/Webkul/Core/src/Contracts/CountryState.php

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+<?php
+
+namespace Webkul\Core\Contracts;
+
+interface CountryState {}

packages/Webkul/Core/src/Contracts/Validations/Code.php

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+<?php
+
+namespace Webkul\Core\Contracts\Validations;
+
+use Illuminate\Contracts\Validation\Rule;
+
+class Code implements Rule
+{
+    /**
+     * Determine if the validation rule passes.
+     *
+     * @param  string  $attribute
+     * @param  mixed  $value
+     * @return bool
+     */
+    public function passes($attribute, $value)
+    {
+        return preg_match('/^[a-zA-Z]+[a-zA-Z0-9_]+$/', $value);
+    }
+
+    /**
+     * Get the validation error message.
+     *
+     * @return string
+     */
+    public function message()
+    {
+        return trans('core::app.validations.code');
+    }
+}

packages/Webkul/Core/src/Contracts/Validations/Decimal.php

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+<?php
+
+namespace Webkul\Core\Contracts\Validations;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class Decimal implements ValidationRule
+{
+    /**
+     * Run the validation rule.
+     *
+     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (! preg_match('/^\d*(\.\d{1,4})?$/', $value)) {
+            $fail(trans('admin::app.validations.message.decimal', ['attribute' => $attribute]));
+        }
+    }
+}