[clap-v3-utils] Deprecate input validators and add parsers to replace…

… them (solana-labs#33276)

* add tests for validating `Pubkey` and `Hash`

* add pubkey signature parser

* add parsers for straightforward validators

* add parser for token amounts

* add parser for derivation and seeds

* resolve warnings from deprecations in clap-v3-utils

* remove some deprecated functions from `solana_keygen`

* refactor signer related input parsers into a submodule

* fix deprecation notice for utl

* refactor parsers in `input_validators` to `input_parsers`

* cargo fmt

* Apply suggestions from code review

Co-authored-by: Trent Nelson <[email protected]>

* Update clap-v3-utils/src/input_parsers/mod.rs

Co-authored-by: Trent Nelson <[email protected]>

* mionr fixes to build

* add deprecation notice for old `input_parsers::signer` functions

* update `UiTokenAmount` to `Amount`

* refactor to-be-deprecated functions back to `input_parsers/mod.rs

* fmt

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Co-authored-by: Trent Nelson <[email protected]>