refactor snapping code

[sfendrich]

Is there an existing issue for this?

• I have searched the existing issues

Problem description

The code for snapping locations to the graph is used at several places and more or less copy-pased in several variants. It is desirable to de-duplicate this for sake of maintainability.

Proposed solution

The experimental PR #2192 contains a commit show-casing how such a refactoring could look like: 4fe7b15

Proposed steps:

• introduce class similar to Snapper as in said commit
• refactor snapping end-point to use the new Snapper class
• refactor map-matching endpoint to use the new Snapper class
• refactor MatrixSearchContextBuilder to use the new Snapper class
• optional: properly introduce external point-data-functionality provided by said PR

Additional context

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Forum Topic Link

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