Search issues and merge request by creation date
<!--IssueSummary start-->
<details>
<summary>
Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards.
</summary>
- [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=121728)
</details>
<!--IssueSummary end-->
### Problem to solve
Hello. I want to get a list of issues or merge requests at (or since, or until) specific date.
### Intended users
<!-- Who will use this feature? If known, include any of the following: types of users (e.g. Developer), personas, or specific company roles (e.g. Release Manager). It's okay to write "Unknown" and fill this field in later.
* [Parker (Product Manager)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#parker-product-manager)
* [Delaney (Development Team Lead)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#delaney-development-team-lead)
* [Sasha (Software Developer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sasha-software-developer)
* [Presley (Product Designer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#presley-product-designer)
* [Devon (DevOps Engineer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#devon-devops-engineer)
* [Sidney (Systems Administrator)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sidney-systems-administrator)
* [Sam (Security Analyst)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sam-security-analyst)
* [Dana (Data Analyst)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#dana-data-analyst)
Personas are described at https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/ -->
Any issues and MRs users.
### Further details
For checking a state of project at specific date, or easier searching of something at a date.
### Proposal
GitHub has such functionality: https://help.github.com/en/github/searching-for-information-on-github/searching-issues-and-pull-requests#search-by-when-an-issue-or-pull-request-was-created-or-last-updated
Pay attention, that there are also comparison operators, like `created:<2011-01-01`.
### Permissions and Security
Viewing issues and/or MRs.
### Documentation
<!-- See the Feature Change Documentation Workflow https://docs.gitlab.com/ee/development/documentation/feature-change-workflow.html
Add all known Documentation Requirements here, per https://docs.gitlab.com/ee/development/documentation/feature-change-workflow.html#documentation-requirements
If this feature requires changing permissions, this document https://docs.gitlab.com/ee/user/permissions.html must be updated accordingly. -->
Links from Feature template look broken, outdated. I don't know what to write in this section.
### Testing
Additional conditions can make search slow.
### What does success look like, and how can we measure that?
A new items in this drop-down:

And working syntax.
### What is the type of buyer?
As you wish, but I think it should be free.
### Links / references
issue