Added option to migrate between repos

[renefloor]

:sparkles: What kind of change does this PR introduce? (Bug fix, feature, docs update...)

Feature

:arrow_heading_down: What is the current behavior?

There is no easy way to migrate to newer CacheInfoRepositories

:new: What is the new behavior (if this is a feature change)?

• Adds a method to migrate.
• Adds methods to the CacheInfoRepositories to make this possible.
• Changes the behaviour of open/close to allow for multiple connections.

:boom: Does this PR introduce a breaking change?

Yes, other implementations of CacheInfoRepository will need to change.

:bug: Recommendations for testing

:memo: Links to relevant issues/docs

:thinking: Checklist before submitting

• [X] All projects build
• [X] Follows style guide lines (code style guide)
• [X] Relevant documentation was updated
• [X] Rebased onto current develop

[codecov[bot]]

Codecov Report

Merging #230 into develop will decrease coverage by 0.39%. The diff coverage is 56.25%.

@@             Coverage Diff             @@
##           develop     #230      +/-   ##
===========================================
- Coverage    75.31%   74.91%   -0.40%     
===========================================
  Files           17       19       +2     
  Lines          559      618      +59     
===========================================
+ Hits           421      463      +42     
- Misses         138      155      +17     

Impacted Files	Coverage Δ
...cache_info_repositories/cache_object_provider.dart	0.00% <0.00%> (ø)
...info_repositories/non_storing_object_provider.dart	0.00% <0.00%> (ø)
..._info_repositories/json_cache_info_repository.dart	92.78% <79.41%> (+1.32%)	:arrow_up:
...cache_info_repositories/cache_info_repository.dart	94.11% <94.11%> (ø)
...torage/cache_info_repositories/helper_methods.dart	100.00% <100.00%> (ø)

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