Specialized TfStringify for integral types to prevent locale dependent writes

[erslavin]

Description of Change(s)

Specializes TfStringify for common integral types to prevent locale dependent writes of numeric data.

Fixes Issue(s)

• USDA Writes Sensitive to User's Locale #3214

• I have verified that all unit tests pass with the proposed changes

• I have submitted a signed Contributor License Agreement

[jesschimein]

Filed as internal issue #USD-9967

[jesschimein]

/AzurePipelines run

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[jesschimein]

/AzurePipelines run

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[spitzak]

std::to_chars prints the shortest possible sequence of digits that accurately represents the floating-point number being encoded. You can't do that with printf the best you can do is %.18g which prints a lot of misleading extra digits instead of rounding to the nearest representative value. It would be a huge advantage to assume all conversions in USD are done using to_chars, it is not only being used to print '.' instead of ','.