Drupal 8 Firld config import via install hooks

field_config_import.yml

use Drupal\Core\Serialization\Yaml;
use \Drupal\field\Entity\FieldConfig;
use \Drupal\field\Entity\FieldStorageConfig;


function moudlename_config_updates_update_8103() {

  //Code for importing field storage.
  $storage = 'field.storage.paragraph.field_related_media';
  $config_path = file_get_contents(DRUPAL_ROOT . '/profiles/custom/profile_name/modules/custom/
  _base_fields/config/install/' . $storage . '.yml');
  $data = Yaml::decode($config_path);
  $fieldStorage = FieldStorageConfig::create($data);
  $fieldStorage->save();

  $files = [
    'paragraphs.paragraphs_type.related_media',
    'core.entity_view_display.paragraph.related_media.default',
    'core.entity_form_display.paragraph.related_media.default'
  ];

  foreach($files as $file_name) {
    $config_path = file_get_contents(DRUPAL_ROOT . '/profiles/custom/profile_name/modules/custom/content_type/article_content_type/config/install/' . $file_name . '.yml');
    $data = Yaml::decode($config_path);
    \Drupal::configFactory()->getEditable($file_name)->setData($data)->save(TRUE);
  }


  $file_name = 'field.field.paragraph.related_media.field_related_media';
  $config_path = file_get_contents(DRUPAL_ROOT . '/profiles/custom/profile_name/modules/custom/content_type/article_content_type/config/install/' . $file_name . '.yml');
  $data = Yaml::decode($config_path);
  $field = FieldConfig::create($data);
  $field->save();


  $storage_file = 'field.field.node.article.field_paragraphs';
  $storage = FieldConfig::load('field.storage.node.field_paragraphs');
  $config_path = file_get_contents(DRUPAL_ROOT . '/profiles/custom/profile_name/modules/custom/content_type/article_content_type/config/install/' . $storage_file . '.yml');
  $data = Yaml::decode($config_path);
  if(!empty($storage)) {
    $uuid = $storage->get('uuid');
    $field = FieldConfig::create($data);
    $field->enforceIsNew(FALSE);
    $field->set('uuid',$uuid);
    $field->save();
  }
}