[BUG] Security namespace is missing from the Client type declaration

[stowns]

What is the bug?

A clear and concise description of the bug.
It appears that security is missing from the Client type declaration which causes "Property 'security' does not exist on type 'Client'" in IDE's.

How can one reproduce the bug?

Steps to reproduce the behavior.

import { Client  } from '@opensearch-project/opensearch';
const client = new Client(...)
client.security

What is the expected behavior?

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The security namespace exists on the client.

What is your host/environment?

Operating system, version.
MacOS 13.6.2

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Do you have any additional context?

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@opensearch-project/opensearch: 2.4.0

The tests added in the commit are in javascript. I believe this is why the issue wasn't observed

[nhtruong]

It's already been added to https://github.com/opensearch-project/opensearch-js/blob/main/api/new.d.ts#L1966
I'm not sure why we have 2 places to declare types for API methods 😅

[GTRanger]

The new.d.ts export is not what is used by default with the import statement import { Client } from '@opensearch-project/opensearch';. Rather, it still points to the definitions in index.d.ts. The default exports need to be updated to use the new type definitions.

[nhtruong]

@GTRanger Did this PR resolve the issue?