Need better byte ordering function in CHIPEncoding

[pan-apple]

Problem

Code is currently using HostSwap* functions to convert from network to host and the opposite. While it works, we need better function names to improve code readability.

Reference: https://github.com/project-chip/connectedhomeip/pull/3630/files#r520135742

Proposed Solution

Add new functions and use them at the relevant points in the code.

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[woody-apple]

#952