Make chronomorphize linear-complexity by default, with constant-complexity as a build option

[pavel-kirienko]

Moving from OpenCyphal-Garage/libcyphal#414

[pavel-kirienko]

@thirtytwobits I understood that it didn't help with the text size, did it?

[pavel-kirienko]

One possible way to combat the .text size: comment out assert and see if it helps:

CETL/include/cetl/pf17/variant.hpp

Line 590 in 82eea02

assert((index.value == other.m_index) && (index.value == this->m_index));