Add pickle.loads fuzz test

[BruceDay]

BPO	41200
Nosy	@gpshead
PRs	bpo-41200: Add pickle.loads fuzz test #21289

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/gpshead'
closed_at = <Date 2021-03-14.02:22:03.959>
created_at = <Date 2020-07-03.10:48:09.413>
labels = ['type-security', 'tests', '3.10']
title = 'Add pickle.loads fuzz test'
updated_at = <Date 2021-03-14.02:22:03.958>
user = 'https://bugs.python.org/BruceDay'

bugs.python.org fields:

activity = <Date 2021-03-14.02:22:03.958>
actor = 'gregory.p.smith'
assignee = 'gregory.p.smith'
closed = True
closed_date = <Date 2021-03-14.02:22:03.959>
closer = 'gregory.p.smith'
components = ['Tests']
creation = <Date 2020-07-03.10:48:09.413>
creator = 'Bruce Day'
dependencies = []
files = []
hgrepos = []
issue_num = 41200
keywords = []
message_count = 2.0
messages = ['372916', '381880']
nosy_count = 2.0
nosy_names = ['gregory.p.smith', 'Bruce Day']
pr_nums = ['21289']
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'security'
url = 'https://bugs.python.org/issue41200'
versions = ['Python 3.10']

[BruceDay]

add pickle.loads(x) fuzz test

[gpshead]

Given that pickle is documented as:

"""
Warning The pickle module is not secure. Only unpickle data you trust.

It is possible to construct malicious pickle data which will execute arbitrary code during unpickling.
"""

https://docs.python.org/3/library/pickle.html

What is fuzzing pickle.loads() expected to accomplish?