feat: add C implementation for @stdlib/stats/base/dists/uniform/mean

[sethdivyansh]

Resolves #3830

Description

• adds C implementation for @stdlib/stats/base/dists/uniform/pdf along with relevant tests, benchmarks and examples

This pull request:

• progresses: [RFC]: Add C implementation for @stdlib/stats/base/dists/uniform/mean #3830

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