MetaEntity::loadOrCreateHelper hits DB every time [#3594355]

Problem/Motivation

MetaEntity::loadOrCreateHelper can be called many times per page load, and hits the DB every time.
This could easily be avoided by calling MetaEntityRepository::getMetaEntitiesForEntity which does use static caching.

Steps to reproduce

(self explanatory)

Proposed resolution

Use MetaEntityRepository::getMetaEntitiesForEntity in MetaEntity::loadOrCreateHelper

Remaining tasks

User interface changes

None

API changes

None

Data model changes

None

Issue fork meta_entity-3594355

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3594355-loadorcreatehelper-perf changes, plain diff MR !21
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