v0.5.0

[saga-dasgupta]

Release a new version with:

• breaking: schema definition traits are keyed by schema type (Key schema definition traits by schema type #138)
• breaking: parsed integers are IntegerValue instead of i32, and the Int range is enforced during coercion (Parse integers losslessly and validate numeric scalar ranges #143)
• breaking: definition rules compose as tuples instead of with combine_definition_rules!, and the paste dependency is gone (Remove paste from definition rule composition #136)
• public IntegerValue::as_i64 and RelayFieldMultipliers::for_connection (Expose IntegerValue::as_i64 and RelayFieldMultipliers::for_connection #145)
• typegen: type overrides for custom scalar fields of input objects (Override the types of input object custom scalar fields #148)
• typegen: a struct for each operation's variables (Generate a struct for each operation's variables #149)
• dependency bumps (Bump syn from 3.0.3 to 3.0.5 #141, Bump trybuild from 1.0.120 to 1.0.121 #142, Bump syn from 3.0.5 to 3.0.6 #144)