Fix typings for toContainEntry, toContainEntries, toContainAllEntries and toContainAnyEntries

[tleunen]

Having the entries to be [string, string] is a bit too limited.
Most the the time, the keys will be strings. Although they could be Symbols too now. But especially for the values where it could be anything...

Why

Typescript complaints when we try to use one of these functions with the entries of an object where the keys or values are not strings.

Housekeeping

• Typescript definitions are added/updated where relevant

[codecov-io]

Codecov Report

Merging #184 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #184   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         109    109           
  Lines         554    554           
  Branches       97     97           
=====================================
  Hits          554    554

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[tleunen]

@mattphillips - I know you're busy. But I'll appreciate if you can take a look when you have some time. No rush though.

[mattphillips]

@tleunen dude my bad leaving this so long to merge!! This is a really nice change, that I can now appreciate as I'm using TS thanks a bunch. I've just published this under v0.11.1