Make property names safe in SDK generation

[danielrbradley]

Hello!

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Issue details

Properties starting with numbers are not valid in the go language and so we need to replace leading numbers with their word equivelent. E.g. a property called 6qi should be created as sixQi.

We should consider this on a per-language basis and refer to each languages's own criteria for properties and other names.

See pulumi/pulumi-azure-native#1528 for a concrete example of this issue.

Affected area/feature

• codegen