feat: Uniform representation of entity repositories

[seanjparker]

Resolves #81

This PR cleans up the Entity repository code a bit, it means you no longer have to have a separate repository for each table. They are all now represented by a single class InjectedRepository<T>, an example of how to use the new representation is below:

export class ExampleService implements ExampleServiceInterface {
	private readonly _exampleRepository: Repository<Example>;

	public constructor(exampleRepository: InjectedRepository<Example>) {
		this._exampleRepository = exampleRepository.getRepository(Example);
	}
}

The exampleRepository constructor parameter is automatically injected by inversify at runtime. (The service dependencies are only evaluated once, when the server starts up)

[codecov]

Codecov Report

Merging #82 into master will decrease coverage by 0.18%.
The diff coverage is 86.36%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
- Coverage   76.10%   75.92%   -0.19%     
==========================================
  Files          56       55       -1     
  Lines        1172     1163       -9     
  Branches      114      114              
==========================================
- Hits          892      883       -9     
  Misses        279      279              
  Partials        1        1              

Impacted Files	Coverage Δ
src/repositories/repositories.ts	82.35% <78.57%> (-17.65%)	⬇️
src/services/applications/applicantService.ts	80.88% <100.00%> (ø)
...c/services/applications/partialApplicantService.ts	100.00% <100.00%> (ø)
src/services/review/reviewService.ts	81.25% <100.00%> (+0.60%)	⬆️

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