feat: configure LMDB db sizes in config file

[kentbull]

Adds ability to configure LMDB sizes using the bootstrap configuration file.
Also adds some INFO level logging on the config file location and database sizes set.

Adds the .mapSize property to LMDBer and the LMDBer.ConfigKey that is overridden in each subclass. This config key is used to select a subset of the overall config file to use to configure each LMDBer subclass.

For backwards compatibility the KERI_BASER_MAP_SIZE environment variable still works, yet may be deprecated in the future. Moving forward using the configuration file as the single source of truth for configuration is the recommended path.

The other GLEIF-IT/keripy specific environment variables have been removed in favor of the configuration file approach shown below.

There is both a global lmdber config block and the subclass specific blocks shown below illustrate how to configure map sizes either globally or per class.

{
  "dt": "2022-01-20T12:57:59.823350+00:00",
  "lmdber": {
    // LMDB Map Size - 50 MB
    "mapSize": 52428800
  },
  "baser": {
    // LMDB Map size - 1 GB
    "mapSize": 1073741824
  },
  "keeper": {
    // LMDB Map Size - 25 MB
    "mapSize": 26214400
  },
  "mailboxer": {
    // LMDB Map Size - 16.384 GB
    "mapSize": 17179869184
  },
  "reger": {
    // LMDB Map Size - 512 MB
    "mapSize": 536870912
  },
  "noter": {
    // LMDB Map Size - 128 MB
    "mapSize": 134217728
  },
  "wan": {
    "dt": "2022-01-20T12:57:59.823350+00:00",
    "curls": ["tcp://127.0.0.1:5632/", "http://127.0.0.1:5642/"]
  },
  "iurls": [
  ]
}

[codecov]

Codecov Report

Attention: Patch coverage is 97.36842% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.24%. Comparing base (887955e) to head (5e66c3a).
Report is 6 commits behind head on v1.2.8.

Files with missing lines	Patch %	Lines
src/keri/db/dbing.py	93.33%	2 Missing ⚠️
src/keri/db/basing.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           v1.2.8      #12      +/-   ##
==========================================
- Coverage   92.25%   92.24%   -0.02%     
==========================================
  Files         119      119              
  Lines       45774    45717      -57     
==========================================
- Hits        42231    42171      -60     
- Misses       3543     3546       +3     

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