Rework filesystem codec implementation

BPO	36775
Nosy	@vstinner
PRs	bpo-36775: Add _Py_FORCE_UTF8_FS_ENCODING macro #13056 bpo-36775: Add _PyUnicode_InitEncodings() #13057 bpo-36775: _PyCoreConfig only uses wchar_t* #13062

^{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 2019-05-02.20:00:16.340>
created_at = <Date 2019-05-02.14:51:44.669>
labels = ['interpreter-core', '3.8']
title = 'Rework filesystem codec implementation'
updated_at = <Date 2019-05-02.20:00:16.340>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2019-05-02.20:00:16.340>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-05-02.20:00:16.340>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2019-05-02.14:51:44.669>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 36775
keywords = ['patch']
message_count = 4.0
messages = ['341267', '341277', '341280', '341302']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['13056', '13057', '13062']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36775'
versions = ['Python 3.8']