Add indenting to toyaml & tojson context methods

[mjsqu]

Resolves #11210

Problem

Printing of large JSON objects for debugging can be difficult when using the inbuilt context method tojson() rather than the Jinja filter, which allows indenting | tojson(indent=4). The underlying methods used, json.dumps and yaml.safe_dump, have ready-made indent parameters which can be leveraged.

Solution

Adds indent parameter to tojson and toyaml context methods, passing the value directly to json.dumps and yaml.safe_dump respectively. The change mirrors the functionality of sort_keys.

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.