rpc: rework binary encoding. BREAKING CHANGE (bp #11646)

[mergify]

This is an automated backport of pull request #11646 done by Mergify

Cherry-pick of b5f3ced has failed:

On branch mergify/bp/v1.2/pr-11646
Your branch is up to date with 'origin/v1.2'.

You are currently cherry-picking commit b5f3ced86.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:

	modified:   Cargo.lock
	modified:   cli/src/cli.rs
	modified:   docs/src/apps/jsonrpc-api.md
	modified:   ledger-tool/src/bigtable.rs
	modified:   ledger/src/blockstore.rs
	modified:   stake-monitor/src/lib.rs
	modified:   transaction-status/src/lib.rs
	modified:   watchtower/src/main.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   transaction-status/Cargo.toml

Cherry-pick of 2ebc68a has failed:

On branch mergify/bp/v1.2/pr-11646
Your branch is ahead of 'origin/v1.2' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 2ebc68a9e.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:

	modified:   transaction-status/src/lib.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   cli/src/cli.rs

Cherry-pick of 757e147 has failed:

On branch mergify/bp/v1.2/pr-11646
Your branch is ahead of 'origin/v1.2' by 2 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 757e147b3.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:

	modified:   account-decoder/src/lib.rs
	modified:   client/src/rpc_client.rs
	modified:   core/src/rpc.rs
	modified:   docs/src/apps/jsonrpc-api.md
	modified:   transaction-status/src/lib.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   cli/src/cli.rs

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[mergify]

automerge label removed due to a CI failure

[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #11673 into v1.2 will decrease coverage by 0.0%.
The diff coverage is 61.9%.

@@           Coverage Diff            @@
##            v1.2   #11673     +/-   ##
========================================
- Coverage   81.9%    81.9%   -0.1%     
========================================
  Files        320      320             
  Lines      76471    76495     +24     
========================================
- Hits       62695    62686      -9     
- Misses     13776    13809     +33