Use std::string_view throughout util strencodings/string
https://github.com/bitcoin/bitcoin/pull/25001/commits/e7d2fbda63c346ae88767c3f8d4db3edeae2dc0b
Replace use of boost::trim use with locale-independent TrimString
Replace use of boost::trim_right with locale-independent TrimString
Note the only use of readStdin is fed to DecodeHexTx, which fails in
IsHex on non-hex characters as recorded in p_util_hexdigit.
tests: Add TrimString(...) tests
This is a partial backport of core#25001 and core#22859
Depends on D17150