TEAL: Fix panic when checking macro names containing non-ASCII runes

[dragmz]

Summary

Fixes a panic when assembling TEAL code containing macros with non-ASCII runes, e.g.:

#define 👩 123

panic: runtime error: index out of range [128105] with length 256

goroutine 1 [running]:
github.com/algorand/go-algorand/data/transactions/logic.checkMacroName({0xc00000bca8, 0x4}, 0xffffffffffffffff, 0xc0007e2fc0)
	github.com/algorand/go-algorand/data/transactions/logic/assembler.go:2210 +0x87e
github.com/algorand/go-algorand/data/transactions/logic.define(0xc000164008, {0xc000390100, 0x3, 0x6?})
	github.com/algorand/go-algorand/data/transactions/logic/assembler.go:2260 +0x21f
github.com/algorand/go-algorand/data/transactions/logic.(*OpStream).assemble(0xc000164008, {0xc00000bb10, 0x10})
	github.com/algorand/go-algorand/data/transactions/logic/assembler.go:2060 +0x470
github.com/algorand/go-algorand/data/transactions/logic.AssembleStringWithVersion({0xc00000bb10, 0x10}, 0xffffffffffffffff)
	github.com/algorand/go-algorand/data/transactions/logic/assembler.go:2760 +0x171
github.com/algorand/go-algorand/data/transactions/logic.AssembleString(...)
	github.com/algorand/go-algorand/data/transactions/logic/assembler.go:2738

Test Plan

Added a new test case to verify that the macro name validation correctly rejects names containing disallowed characters.

[jannotti]

Thank you.