docs: 13793 platform design proposal process

[poulok]

Description

Introduces documentation for the new Platform Design Proposal process.

Updates From Last Version

1. Change the definition of business days to be all days from Monday through Friday including holidays that fall during these days
2. Clarify how votes are cast

Related issue(s)

Fixes https://github.com/hashgraph/hedera-services/issues/13793

Previous Iterations

1. https://github.com/hashgraph/hedera-services/pull/13796
2. https://github.com/hashgraph/hedera-services/pull/13870
3. https://github.com/hashgraph/hedera-services/pull/14065

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Node: HAPI Test (Node Death Reconnect) Results

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Node: HAPI Test (Token) Results

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Node: HAPI Test (Smart Contract) Results

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Node: HAPI Test (Misc) Results

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Node: Unit Test Results

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