Add methods for getting nearest knmi time series #580

Job	Run time
Lint	39s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 48s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 41s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 38s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 46s
Tests (3.10, git+https://github.com/pastas/pastas.git@dev)	1m 36s
Tests (3.11, git+https://github.com/pastas/[email protected])	1m 45s
Tests (3.11, git+https://github.com/pastas/[email protected])	1m 46s
Tests (3.11, git+https://github.com/pastas/[email protected])	1m 42s
Tests (3.11, git+https://github.com/pastas/[email protected])	2m 5s
Tests (3.11, git+https://github.com/pastas/pastas.git@dev)	2m 53s
Tests (3.12, git+https://github.com/pastas/[email protected])	1m 33s
Tests (3.12, git+https://github.com/pastas/pastas.git@dev)	1m 35s
	22m 27s

Provide feedback