az consumption usage list errors out with memoryError

## Describe the bug

When there is a large amount of resources (>2750), resource groups (>150) in a subscription and you run the command for a past billing period (e.g. 202106) it is possible to produce a memory error. Running the command multiple times with smaller parts of the billing period (e.g. day 1-10, 11-20, 20-31) is a workaround but I would assume not a suitable one for everyone.

**Command Name**
`az consumption usage list`

**Errors:**
```
The command failed with an unexpected error. Here is the traceback:

Traceback (most recent call last):
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 237, in invoke
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 146, in out
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 38, in format_json
File "json\__init__.py", line 238, in dumps
File "json\encoder.py", line 202, in encode
MemoryError
```

## To Reproduce:
Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

- _Put any pre-requisite steps here..._
- `az consumption usage list --subscription {} --billing-period-name {}`

## Expected Behavior

## Environment Summary
```
Windows-10-10.0.19041-SP0
Python 3.6.8
Installer: MSI

azure-cli 2.22.1

Extensions:
account 0.2.1
ad 0.1.0
application-insights 0.1.13
azure-devops 0.18.0
resource-graph 2.0.0

```
## Additional Context

Start with the az consumption usage list command and trace how its results reach knack/output.py, especially format_json, as named in the traceback. Reproduce with a large billing-period query and determine whether the command can complete without MemoryError; the issue provides no test file or more specific completion criteria.

Written by the indexing model from the issue text.