[Experimental] Add support for mathematical operators '+' and '-' in XDR query utility #162

Job	Run time
rust-check-git-rev-deps	23s
build (gcc, current)	4m 17s
fmt	27s
cargo-deny (advisories)	55s
build (gcc, current, --check-test-tx-meta)	3m 31s
cargo-deny (bans licenses sources)	42s
build (gcc, next)	8m 16s
build (gcc, next, --check-test-tx-meta)	7m 31s
build (clang, current)	4m 11s
build (clang, current, --check-test-tx-meta)	3m 29s
build (clang, next)	4m 20s
build (clang, next, --check-test-tx-meta)	3m 19s
complete	1s
	41m 22s

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