Fix noise level cache invalidation and sampling parameters - #4942

This PR addresses #4928 by improving how noise levels are cached and reused.

The main idea is to keep track of the sampling parameters used to compute each noise-level estimate, so that cached values are only reused when they are compatible with the current request.

In particular, this PR:

• Normalizes the sampling parameters before checking the cache, including default values and the conversion of chunk_duration to frames.
• Stores the effective parameters in recording._noise_levels_params.
• Reuses cached values when the sampling configuration matches. When seed=None is requested, an existing estimate can be reused regardless of the stored seed, as long as the chunk layout is compatible.
• Preserves manually assigned noise-level properties and values loaded from saved recordings when the default sampling configuration is used.
• Keeps the cache metadata consistent when noise-level properties are overwritten or deleted.
• Invalidates scaled noise-level estimates when calibration properties such as gain_to_uV or offset_to_uV change.
• Updates highpass_spatial_filter to obtain RMS values through get_noise_levels() instead of accessing the cached property directly.

Regression tests have been added for the caching behavior, parameter compatibility, seed handling, calibration changes, and the high-pass spatial filter integration.