Implement auto cache removal

[seapagan]

WIP to implement auto cache removal when a PUSH/PUT etc modifies the data.

This is done using a @expires decorator to the route that potentially changes data. At the moment, it will expire anyway, need to ensure it doesn't expire if the data is unchanged (check the status on the decorated function return - perhaps add this as an option to the constructor)

There will also be a method to manually expire a cache key on demand.

Coverage will fail for this PR until the new code is added to tests

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
❌ -6.67% (target: -1.00%)	✅ 32.35%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (b7b7dc8)	279	258	92.47%
Head commit (7615899)	310 (+31)	266 (+8)	85.81% (-6.67%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#21)	34	11	32.35%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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