Add `ord` and `chr` functions

[simplepad]

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Use Cases

My particular use case is checking bit flags in a string of raw bytes. When #1386 lands, it will add the required comparison functions, but I also need a way to convert a raw byte (a string) into an integer.

Attempted Solutions

No response

Proposal

Add two functions:

1. ord(value: string, [position: integer]) - gives integer representation of the first character in a string (optionally the character at a certain position), this is a workaround for VRL not having a character type.
2. chr(value: integer) - converts an integer into a character, the inverse of ord()

These functions should probably be added to the "Convert functions" section.

References

No response