routing: add TlvTrafficShaper to bandwidth hints

[GeorgeTsagk]

Description

Closes #8617

Based on #8660

This PR adds a TlvTrafficShaper function as part of the bandwidth hints. This function can be optionally defined to provide an external way of evaluating whether a channel is capable of carrying out a payment or not.

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[dstadulis]

Was unable to determine why GH isn't linking this PR to the issue

Closes https://github.com/lightningnetwork/lnd/issues/8617

Possibly, not attempting to merge on main?

[lightninglabs-deploy]

@georgetsagk, remember to re-request review from reviewers when ready