Expose dict_proxy type from descrobject.c

[ndparker]

BPO	14226
Nosy	@ndparker, @ericsnowcurrently
Superseder	bpo-14386: Expose dict_proxy internal type as types.MappingProxyType

^{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 = None
closed_at = <Date 2012-06-23.21:48:09.992>
created_at = <Date 2012-03-07.23:35:39.470>
labels = ['extension-modules', 'interpreter-core', 'type-feature']
title = 'Expose dict_proxy type from descrobject.c'
updated_at = <Date 2012-06-23.21:48:09.992>
user = 'https://github.com/ndparker'

bugs.python.org fields:

activity = <Date 2012-06-23.21:48:09.992>
actor = 'eric.snow'
assignee = 'none'
closed = True
closed_date = <Date 2012-06-23.21:48:09.992>
closer = 'eric.snow'
components = ['Extension Modules', 'Interpreter Core']
creation = <Date 2012-03-07.23:35:39.470>
creator = 'ndparker'
dependencies = []
files = []
hgrepos = []
issue_num = 14226
keywords = []
message_count = 1.0
messages = ['155131']
nosy_count = 2.0
nosy_names = ['ndparker', 'eric.snow']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = '14386'
type = 'enhancement'
url = 'https://bugs.python.org/issue14226'
versions = []

[ndparker]

As discussed in the dev-thread about frozendicts, it would be helpful for providing advisory read-only-dicts, to just expose the dict_proxy type. I suppose, the collections module would be a good place (it just needs to provide the interface to the type, not the whole implementation).