[Cashtab] [Alias] Enforce alphanumeric inputs
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Description

[Cashtab] [Alias] Enforce alphanumeric inputs

Summary:
T2551

As per feedback from beta testing, the initial release will be limited to lowercase alphanumeric inputs.

Test Plan:

enable Alias in ticker.js
npm start
navigate to Alias.js and ensure lowercase a-z and 0-9 inputs within 21 bytes are all accepted and successfully registered
ensure zero-width spaces, special characters, non-english characters and emojis are invalid.

*new tests*

open a wallet that has registered non-alphanumeric aliases prior to this diff
observe console log message Non-alphanumeric alias detected in cache, resetting aliasCache and a full alias tx history retrival is triggered
navigate to Alias.js and ensure the registered list only shows alphanumeric aliases
register a new alias and ensure only partial alias tx history retrieval is triggered
inspect aliasCache in localforage and ensure no non-alphanumeric aliases in alias array. Also note the size of paymentTxHistory being much larger than aliases due to the invalidation of previously valid non-alphanumeric aliases.

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc