Ics20Reader::get_channel_escrow_address() default impl is inconsistent with Ics20Reader::AccountId

[hu55a1n1]

Summary of Bug

The provided implementation of the Ics20Reader::get_channel_escrow_address() trait method assumes that the Ics20Reader::AccountId type is not encoded (which is unlikely in practise).

The problem is that most host implementations (including the Cosmos SDK) would use a bech32 encoded AccountId whereas the AccountId returned by get_channel_escrow_address() (and the underlying cosmos_adr028_escrow_address() function that it uses) isn't bech32 encoded.

Version

v0.16.0

Acceptance Criteria

Ics20Reader::get_channel_escrow_address() returns a bech32 encoded address or cosmos_adr028_escrow_address() is made public.

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