Configuration support for wrapping malloc-family

[kpschoedel]

Problem

CHIP currently has a single ‘funnel’ for its own heap allocations (CHIPMem.h), which is in principle configurable at build time, but CHIP applications invariably include non-CHIP code. Some commonly used third party libraries include their own wrappers (e.g. mbedtls, openthread) but ensuring that all of these are configured appropriately is difficult (e.g. #5242) and does not guarantee that an application will not unknowingly use the malloc family via some language or third-party library.

The only common underlying interface is the malloc family. Popular linkers have a --wrap option that can be used to provide substitutes for these globally, regardless of origin. CHIP should support this so that building with a custom heap is simple and safe.

Proposed Solution

Pigweed has GN build support for this that we can imitate if not use directly.

[kpschoedel]

@tcarmelveilleux @mspang @doru91

[stale]

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[stale]

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