refactor: Remove code from components/stacks-codec

[jbencin-stacks]

Description

I'm working towards removing as much of components/stacks-codec as possible. Most of it is code duplicated from stacks-network/stacks-core.

This PR removes some of that code, but additional refactoring of stacks-core will be needed to remove more of it

Breaking change?

No

Example

Removes a lot of code

[codecov]

Codecov Report

❌ Patch coverage is 55.55556% with 40 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
components/stacks-codec/src/codec.rs	0.00%	39 Missing ⚠️
...omponents/stacks-network/src/chains_coordinator.rs	50.00%	1 Missing ⚠️

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[Copilot]

Pull request overview

This PR reduces reliance on the duplicated components/stacks-codec implementations by switching multiple crates to use transaction types from stackslib (stacks-core) and relocating the contract-call transaction builder into stacks-rpc-client.

Changes:

• Replace stacks_codec::codec::* transaction type usage with stackslib::chainstate::stacks::* in rpc-client and observer.
• Move build_contract_call_transaction out of stacks-codec and into stacks-rpc-client::crypto, updating call sites.
• Remove/trim duplicated code from components/stacks-codec, and adjust crate dependencies/features accordingly.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
components/stacks-rpc-client/src/rpc_client.rs	Switches transaction imports from stacks-codec to stackslib.
components/stacks-rpc-client/src/crypto.rs	Replaces codec imports with stackslib types and adds build_contract_call_transaction.
components/stacks-rpc-client/Cargo.toml	Drops stacks-codec dependency and adds stackslib.
components/stacks-network/src/chains_coordinator.rs	Updates contract-call tx builder call sites to use stacks-rpc-client.
components/stacks-network/Cargo.toml	Removes stacks-codec dependency.
components/stacks-codec/src/codec.rs	Deletes substantial duplicated functionality/types, keeping only what’s still needed.
components/observer/src/indexer/stacks/mod.rs	Switches transaction imports from stacks-codec to stackslib.
components/observer/Cargo.toml	Makes stacks-codec optional and ties it to the stacks-signers feature; adds stackslib.
components/clarinet-deployments/src/onchain/mod.rs	Switches transaction/string types from stacks-codec to stackslib.
components/clarinet-deployments/Cargo.toml	Drops stacks-codec dependency and adds stackslib.
Cargo.lock	Lockfile updates reflecting dependency graph changes.

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